diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index 112665e1723..0458c5471d2 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -1269,7 +1269,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         types.push(firstType);
 
         // Second type
-        let secondType: Type | null = null;
+        let secondType: Type = Type.UNKNOWN;
 
         if (fusionSpeciesForm) {
           // Check if the fusion Pokemon also has permanent changes from ME when determining the fusion types
@@ -1287,10 +1287,10 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         } else {
           // If not a fusion, just get the second type from the species, checking for permanent changes from ME
           secondType = (customTypes && this.customPokemonData.types.length > 1 && this.customPokemonData.types[1] !== Type.UNKNOWN)
-            ? this.customPokemonData.types[1] : speciesForm.type2;
+            ? this.customPokemonData.types[1] : (speciesForm.type2 ?? Type.UNKNOWN);
         }
 
-        if (secondType) {
+        if (secondType !== Type.UNKNOWN) {
           types.push(secondType);
         }
       }
diff --git a/src/test/field/pokemon.test.ts b/src/test/field/pokemon.test.ts
index b8b7349c1f8..0a1ddac9e90 100644
--- a/src/test/field/pokemon.test.ts
+++ b/src/test/field/pokemon.test.ts
@@ -97,16 +97,14 @@ describe("Spec - Pokemon", () => {
       expect(types[0]).toBe(Type.PSYCHIC);
       expect(types[1]).toBe(Type.FIRE);
 
-      // Abra Psychic/Grass
-      pokemon.customPokemonData.types = [ Type.UNKNOWN, Type.GRASS ];
+      pokemon.customPokemonData.types = [ Type.UNKNOWN, Type.NORMAL ];
       types = pokemon.getTypes();
       expect(types[0]).toBe(Type.PSYCHIC);
       expect(types[1]).toBe(Type.FIRE);
 
-      // Abra Grass
-      pokemon.customPokemonData.types = [ Type.GRASS, Type.UNKNOWN ];
+      pokemon.customPokemonData.types = [ Type.NORMAL, Type.UNKNOWN ];
       types = pokemon.getTypes();
-      expect(types[0]).toBe(Type.GRASS);
+      expect(types[0]).toBe(Type.NORMAL);
       expect(types[1]).toBe(Type.FIRE);
 
       if (!pokemon.fusionCustomPokemonData) {
@@ -114,24 +112,20 @@ describe("Spec - Pokemon", () => {
       }
       pokemon.customPokemonData.types = [];
 
-      // Charmander Fire/Grass
-      pokemon.fusionCustomPokemonData.types = [ Type.UNKNOWN, Type.GRASS ];
+      pokemon.fusionCustomPokemonData.types = [ Type.UNKNOWN, Type.NORMAL ];
       types = pokemon.getTypes();
       expect(types[0]).toBe(Type.PSYCHIC);
-      expect(types[1]).toBe(Type.GRASS);
+      expect(types[1]).toBe(Type.NORMAL);
 
-      // Charmander Grass
-      pokemon.fusionCustomPokemonData.types = [ Type.GRASS, Type.UNKNOWN ];
+      pokemon.fusionCustomPokemonData.types = [ Type.NORMAL, Type.UNKNOWN ];
       types = pokemon.getTypes();
       expect(types[0]).toBe(Type.PSYCHIC);
-      expect(types[1]).toBe(Type.GRASS);
+      expect(types[1]).toBe(Type.NORMAL);
 
-      // Abra Grass
-      // Charmander Fire/Grass
-      pokemon.customPokemonData.types = [ Type.GRASS, Type.UNKNOWN ];
-      pokemon.fusionCustomPokemonData.types = [ Type.UNKNOWN, Type.GRASS ];
+      pokemon.customPokemonData.types = [ Type.NORMAL, Type.UNKNOWN ];
+      pokemon.fusionCustomPokemonData.types = [ Type.UNKNOWN, Type.NORMAL ];
       types = pokemon.getTypes();
-      expect(types[0]).toBe(Type.GRASS);
+      expect(types[0]).toBe(Type.NORMAL);
       expect(types[1]).toBe(Type.FIRE);
     });
 
diff --git a/src/test/moves/effectiveness.test.ts b/src/test/moves/effectiveness.test.ts
index 7742178f595..c78416b1237 100644
--- a/src/test/moves/effectiveness.test.ts
+++ b/src/test/moves/effectiveness.test.ts
@@ -73,6 +73,10 @@ describe("Moves - Type Effectiveness", () => {
     () => testMoveEffectiveness(game, Moves.THUNDERBOLT, Species.BLASTOISE, 2)
   );
 
+  it("Ghost-type attacks have no effect on Normal-type Pokemon",
+    () => testMoveEffectiveness(game, Moves.SHADOW_BALL, Species.URSALUNA, 0)
+  );
+
   it("Electric-type attacks are doubly super-effective against Water/Flying-type Pokemon",
     () => testMoveEffectiveness(game, Moves.THUNDERBOLT, Species.GYARADOS, 4)
   );