diff --git a/src/data/battler-tags.ts b/src/data/battler-tags.ts
index 66b6676a4f5..4685a4fc7e1 100644
--- a/src/data/battler-tags.ts
+++ b/src/data/battler-tags.ts
@@ -1885,11 +1885,18 @@ export class CursedTag extends BattlerTag {
     return ret;
   }
 }
+/**
+ * Battler tag for attacks that remove a type post use.
+ */
+export class RemovedTypeTag extends BattlerTag {
+  constructor(tagType: BattlerTagType, lapseType: BattlerTagLapseType, sourceMove: Moves) {
+    super(tagType, lapseType, 1, sourceMove);
+  }
+}
 
 /**
- * Battler tag for effects that ground the source, allowing Ground-type moves to hit them. Encompasses two tag types:
- * @item `IGNORE_FLYING`: Persistent grounding effects (i.e. from Smack Down and Thousand Waves)
- * @item `ROOSTED`: One-turn grounding effects (i.e. from Roost)
+ * Battler tag for effects that ground the source, allowing Ground-type moves to hit them.
+ * @description `IGNORE_FLYING`: Persistent grounding effects (i.e. from Smack Down and Thousand Waves)
  */
 export class GroundedTag extends BattlerTag {
   constructor(tagType: BattlerTagType, lapseType: BattlerTagLapseType, sourceMove: Moves) {
@@ -1897,6 +1904,70 @@ export class GroundedTag extends BattlerTag {
   }
 }
 
+/**
+ * @description `ROOSTED`: Tag for temporary grounding if only source of ungrounding is flying and pokemon uses Roost.
+ * Roost removes flying type from a pokemon for a single turn.
+ */
+
+export class RoostedTag extends BattlerTag {
+  private isBaseFlying : boolean;
+  private isBasePureFlying : boolean;
+
+  constructor() {
+    super(BattlerTagType.ROOSTED, BattlerTagLapseType.TURN_END, 1, Moves.ROOST);
+  }
+
+  onRemove(pokemon: Pokemon): void {
+    const currentTypes = pokemon.getTypes();
+    const baseTypes = pokemon.getTypes(false, false, true);
+
+    const forestsCurseApplied: boolean = currentTypes.includes(Type.GRASS) && !baseTypes.includes(Type.GRASS);
+    const trickOrTreatApplied: boolean = currentTypes.includes(Type.GHOST) && !baseTypes.includes(Type.GHOST);
+
+    if (this.isBaseFlying) {
+      let modifiedTypes: Type[] = [];
+      if (this.isBasePureFlying) {
+        if (forestsCurseApplied || trickOrTreatApplied) {
+          modifiedTypes = currentTypes.filter(type => type !== Type.NORMAL);
+          modifiedTypes.push(Type.FLYING);
+        } else {
+          modifiedTypes = [Type.FLYING];
+        }
+      } else {
+        modifiedTypes = [...currentTypes];
+        modifiedTypes.push(Type.FLYING);
+      }
+      pokemon.summonData.types = modifiedTypes;
+      pokemon.updateInfo();
+    }
+  }
+
+  onAdd(pokemon: Pokemon): void {
+    const currentTypes = pokemon.getTypes();
+    const baseTypes = pokemon.getTypes(false, false, true);
+
+    const isOriginallyDualType = baseTypes.length === 2;
+    const isCurrentlyDualType = currentTypes.length === 2;
+    this.isBaseFlying = baseTypes.includes(Type.FLYING);
+    this.isBasePureFlying = baseTypes[0] === Type.FLYING && baseTypes.length === 1;
+
+    if (this.isBaseFlying) {
+      let modifiedTypes: Type[];
+      if (this.isBasePureFlying && !isCurrentlyDualType) {
+        modifiedTypes = [Type.NORMAL];
+      } else {
+        if (!!pokemon.getTag(RemovedTypeTag) && isOriginallyDualType && !isCurrentlyDualType) {
+          modifiedTypes = [Type.UNKNOWN];
+        } else {
+          modifiedTypes = currentTypes.filter(type => type !== Type.FLYING);
+        }
+      }
+      pokemon.summonData.types = modifiedTypes;
+      pokemon.updateInfo();
+    }
+  }
+}
+
 /** Common attributes of form change abilities that block damage */
 export class FormBlockDamageTag extends BattlerTag {
   constructor(tagType: BattlerTagType) {
@@ -2259,7 +2330,11 @@ export function getBattlerTag(tagType: BattlerTagType, turnCount: number, source
   case BattlerTagType.IGNORE_FLYING:
     return new GroundedTag(tagType, BattlerTagLapseType.CUSTOM, sourceMove);
   case BattlerTagType.ROOSTED:
-    return new GroundedTag(tagType, BattlerTagLapseType.TURN_END, sourceMove);
+    return new RoostedTag();
+  case BattlerTagType.BURNED_UP:
+    return new RemovedTypeTag(tagType, BattlerTagLapseType.CUSTOM, sourceMove);
+  case BattlerTagType.DOUBLE_SHOCKED:
+    return new RemovedTypeTag(tagType, BattlerTagLapseType.CUSTOM, sourceMove);
   case BattlerTagType.SALT_CURED:
     return new SaltCuredTag(sourceId);
   case BattlerTagType.CURSED:
diff --git a/src/data/move.ts b/src/data/move.ts
index 672a1154a0e..f09f8db7487 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -8532,6 +8532,7 @@ export function initMoves() {
         return userTypes.includes(Type.FIRE);
       })
       .attr(HealStatusEffectAttr, true, StatusEffect.FREEZE)
+      .attr(AddBattlerTagAttr, BattlerTagType.BURNED_UP, true, false)
       .attr(RemoveTypeAttr, Type.FIRE, (user) => {
         user.scene.queueMessage(i18next.t("moveTriggers:burnedItselfOut", {pokemonName: getPokemonNameWithAffix(user)}));
       }),
@@ -9315,6 +9316,7 @@ export function initMoves() {
         const userTypes = user.getTypes(true);
         return userTypes.includes(Type.ELECTRIC);
       })
+      .attr(AddBattlerTagAttr, BattlerTagType.DOUBLE_SHOCKED, true, false)
       .attr(RemoveTypeAttr, Type.ELECTRIC, (user) => {
         user.scene.queueMessage(i18next.t("moveTriggers:usedUpAllElectricity", {pokemonName: getPokemonNameWithAffix(user)}));
       }),
diff --git a/src/enums/battler-tag-type.ts b/src/enums/battler-tag-type.ts
index cb83ebf4882..105f359df76 100644
--- a/src/enums/battler-tag-type.ts
+++ b/src/enums/battler-tag-type.ts
@@ -76,4 +76,6 @@ export enum BattlerTagType {
   GORILLA_TACTICS = "GORILLA_TACTICS",
   THROAT_CHOPPED = "THROAT_CHOPPED",
   TAR_SHOT = "TAR_SHOT",
+  BURNED_UP = "BURNED_UP",
+  DOUBLE_SHOCKED = "DOUBLE_SHOCKED",
 }
diff --git a/src/test/moves/roost.test.ts b/src/test/moves/roost.test.ts
index cf07a3485e7..df7fc7096b0 100644
--- a/src/test/moves/roost.test.ts
+++ b/src/test/moves/roost.test.ts
@@ -1,4 +1,4 @@
-import { Abilities } from "#app/enums/abilities";
+import { Type } from "#app/data/type";
 import { BattlerTagType } from "#app/enums/battler-tag-type";
 import { Moves } from "#app/enums/moves";
 import { Species } from "#app/enums/species";
@@ -27,33 +27,234 @@ describe("Moves - Roost", () => {
   beforeEach(() => {
     game = new GameManager(phaserGame);
     game.override.battleType("single");
-    game.override.enemySpecies(Species.STARAPTOR);
-    game.override.enemyAbility(Abilities.INSOMNIA);
+    game.override.enemySpecies(Species.RELICANTH);
     game.override.startingLevel(100);
-    game.override.enemyLevel(100);
-    game.override.moveset([Moves.STOMPING_TANTRUM]);
-    game.override.enemyMoveset([Moves.ROOST, Moves.ROOST, Moves.ROOST, Moves.ROOST]);
+    game.override.enemyLevel(60);
+    game.override.enemyMoveset(Moves.EARTHQUAKE);
+    game.override.moveset([Moves.ROOST, Moves.BURN_UP, Moves.DOUBLE_SHOCK]);
+    game.override.starterForms({ [Species.ROTOM]: 4 });
   });
 
+  /**
+   * Roost's behavior should be defined as:
+   * The pokemon loses its flying type for a turn. If the pokemon was ungroundd solely due to being a flying type, it will be grounded until end of turn.
+   * 1. Pure Flying type pokemon -> become normal type until end of turn
+   * 2. Dual Flying/X type pokemon -> become type X until end of turn
+   * 3. Pokemon that use burn up into roost (ex. Moltres) -> become flying due to burn up, then typeless until end of turn after using roost
+   * 4. If a pokemon is afflicted with Forest's Curse or Trick or treat, dual type pokemon will become 3 type pokemon after the flying type is regained
+   *    Pure flying types become (Grass or Ghost) and then back to flying/ (Grass or Ghost),
+   *    and pokemon post Burn up become ()
+   * 5. If a pokemon is also ungrounded due to other reasons (such as levitate), it will stay ungrounded post roost, despite not being flying type.
+   * 6. Non flying types using roost (such as dunsparce) are already grounded, so this move will only heal and have no other effects.
+   */
+
   test(
-    "move should ground the user until the end of turn",
+    "Non flying type uses roost -> no type change, took damage",
     async () => {
-      await game.startBattle([Species.MAGIKARP]);
-
-      const enemyPokemon = game.scene.getEnemyPokemon()!;
-
-      const enemyStartingHp = enemyPokemon.hp;
-
-      game.move.select(Moves.STOMPING_TANTRUM);
-
+      await game.classicMode.startBattle([Species.DUNSPARCE]);
+      const playerPokemon = game.scene.getPlayerPokemon()!;
+      const playerPokemonStartingHP = playerPokemon.hp;
+      game.move.select(Moves.ROOST);
       await game.phaseInterceptor.to(MoveEffectPhase);
 
-      expect(enemyPokemon.getTag(BattlerTagType.ROOSTED)).toBeDefined();
+      // Should only be normal type, and NOT flying type
+      let playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemonTypes[0] === Type.NORMAL).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeTruthy();
 
       await game.phaseInterceptor.to(TurnEndPhase);
 
-      expect(enemyPokemon.hp).toBeLessThan(enemyStartingHp);
-      expect(enemyPokemon.getTag(BattlerTagType.ROOSTED)).toBeUndefined();
+      // Lose HP, still normal type
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemon.hp).toBeLessThan(playerPokemonStartingHP);
+      expect(playerPokemonTypes[0] === Type.NORMAL).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeTruthy();
     }, TIMEOUT
   );
+
+  test(
+    "Pure flying type -> becomes normal after roost and takes damage from ground moves -> regains flying",
+    async () => {
+      await game.classicMode.startBattle([Species.TORNADUS]);
+      const playerPokemon = game.scene.getPlayerPokemon()!;
+      const playerPokemonStartingHP = playerPokemon.hp;
+      game.move.select(Moves.ROOST);
+      await game.phaseInterceptor.to(MoveEffectPhase);
+
+      // Should only be normal type, and NOT flying type
+      let playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemonTypes[0] === Type.NORMAL).toBeTruthy();
+      expect(playerPokemonTypes[0] === Type.FLYING).toBeFalsy();
+      expect(playerPokemon.isGrounded()).toBeTruthy();
+
+      await game.phaseInterceptor.to(TurnEndPhase);
+
+      // Should have lost HP and is now back to being pure flying
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemon.hp).toBeLessThan(playerPokemonStartingHP);
+      expect(playerPokemonTypes[0] === Type.NORMAL).toBeFalsy();
+      expect(playerPokemonTypes[0] === Type.FLYING).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeFalsy();
+
+    }, TIMEOUT
+  );
+
+  test(
+    "Dual X/flying type -> becomes type X after roost and takes damage from ground moves -> regains flying",
+    async () => {
+      await game.classicMode.startBattle([Species.HAWLUCHA]);
+      const playerPokemon = game.scene.getPlayerPokemon()!;
+      const playerPokemonStartingHP = playerPokemon.hp;
+      game.move.select(Moves.ROOST);
+      await game.phaseInterceptor.to(MoveEffectPhase);
+
+      // Should only be pure fighting type and grounded
+      let playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemonTypes[0] === Type.FIGHTING).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeTruthy();
+
+      await game.phaseInterceptor.to(TurnEndPhase);
+
+      // Should have lost HP and is now back to being fighting/flying
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemon.hp).toBeLessThan(playerPokemonStartingHP);
+      expect(playerPokemonTypes[0] === Type.FIGHTING).toBeTruthy();
+      expect(playerPokemonTypes[1] === Type.FLYING).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeFalsy();
+
+    }, TIMEOUT
+  );
+
+  test(
+    "Pokemon with levitate after using roost should lose flying type but still be unaffected by ground moves",
+    async () => {
+      await game.classicMode.startBattle([Species.ROTOM]);
+      const playerPokemon = game.scene.getPlayerPokemon()!;
+      const playerPokemonStartingHP = playerPokemon.hp;
+      game.move.select(Moves.ROOST);
+      await game.phaseInterceptor.to(MoveEffectPhase);
+
+      // Should only be pure fighting type and grounded
+      let playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemonTypes[0] === Type.ELECTRIC).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeFalsy();
+
+      await game.phaseInterceptor.to(TurnEndPhase);
+
+      // Should have lost HP and is now back to being fighting/flying
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemon.hp).toBe(playerPokemonStartingHP);
+      expect(playerPokemonTypes[0] === Type.ELECTRIC).toBeTruthy();
+      expect(playerPokemonTypes[1] === Type.FLYING).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeFalsy();
+
+    }, TIMEOUT
+  );
+
+  test(
+    "A fire/flying type that uses burn up, then roost should be typeless until end of turn",
+    async () => {
+      await game.classicMode.startBattle([Species.MOLTRES]);
+      const playerPokemon = game.scene.getPlayerPokemon()!;
+      const playerPokemonStartingHP = playerPokemon.hp;
+      game.move.select(Moves.BURN_UP);
+      await game.phaseInterceptor.to(MoveEffectPhase);
+
+      // Should only be pure flying type after burn up
+      let playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemonTypes[0] === Type.FLYING).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+
+      await game.phaseInterceptor.to(TurnEndPhase);
+      game.move.select(Moves.ROOST);
+      await game.phaseInterceptor.to(MoveEffectPhase);
+
+      // Should only be typeless type after roost and is grounded
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemon.getTag(BattlerTagType.ROOSTED)).toBeDefined();
+      expect(playerPokemonTypes[0] === Type.UNKNOWN).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeTruthy();
+
+      await game.phaseInterceptor.to(TurnEndPhase);
+
+      // Should go back to being pure flying and have taken damage from earthquake, and is ungrounded again
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemon.hp).toBeLessThan(playerPokemonStartingHP);
+      expect(playerPokemonTypes[0] === Type.FLYING).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeFalsy();
+
+    }, TIMEOUT
+  );
+
+  test(
+    "An electric/flying type that uses double shock, then roost should be typeless until end of turn",
+    async () => {
+      game.override.enemySpecies(Species.ZEKROM);
+      await game.classicMode.startBattle([Species.ZAPDOS]);
+      const playerPokemon = game.scene.getPlayerPokemon()!;
+      const playerPokemonStartingHP = playerPokemon.hp;
+      game.move.select(Moves.DOUBLE_SHOCK);
+      await game.phaseInterceptor.to(MoveEffectPhase);
+
+      // Should only be pure flying type after burn up
+      let playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemonTypes[0] === Type.FLYING).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+
+      await game.phaseInterceptor.to(TurnEndPhase);
+      game.move.select(Moves.ROOST);
+      await game.phaseInterceptor.to(MoveEffectPhase);
+
+      // Should only be typeless type after roost and is grounded
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemon.getTag(BattlerTagType.ROOSTED)).toBeDefined();
+      expect(playerPokemonTypes[0] === Type.UNKNOWN).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeTruthy();
+
+      await game.phaseInterceptor.to(TurnEndPhase);
+
+      // Should go back to being pure flying and have taken damage from earthquake, and is ungrounded again
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemon.hp).toBeLessThan(playerPokemonStartingHP);
+      expect(playerPokemonTypes[0] === Type.FLYING).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeFalsy();
+
+    }, TIMEOUT
+  );
+
+  test(
+    "Dual Type Pokemon afflicted with Forests Curse/Trick or Treat and post roost will become dual type and then become 3 type at end of turn",
+    async () => {
+      game.override.enemyMoveset([Moves.TRICK_OR_TREAT, Moves.TRICK_OR_TREAT, Moves.TRICK_OR_TREAT, Moves.TRICK_OR_TREAT]);
+      await game.classicMode.startBattle([Species.MOLTRES]);
+      const playerPokemon = game.scene.getPlayerPokemon()!;
+      game.move.select(Moves.ROOST);
+      await game.phaseInterceptor.to(MoveEffectPhase);
+
+      let playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemonTypes[0] === Type.FIRE).toBeTruthy();
+      expect(playerPokemonTypes.length === 1).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeTruthy();
+
+      await game.phaseInterceptor.to(TurnEndPhase);
+
+      // Should be fire/flying/ghost
+      playerPokemonTypes = playerPokemon.getTypes();
+      expect(playerPokemonTypes.filter(type => type === Type.FLYING)).toHaveLength(1);
+      expect(playerPokemonTypes.filter(type => type === Type.FIRE)).toHaveLength(1);
+      expect(playerPokemonTypes.filter(type => type === Type.GHOST)).toHaveLength(1);
+      expect(playerPokemonTypes.length === 3).toBeTruthy();
+      expect(playerPokemon.isGrounded()).toBeFalsy();
+
+    }, TIMEOUT
+  );
+
 });