Fix ingrain for Phantump and Trevenant (#856) (#998)

src/data/battler-tags.ts

@@ -15,6 +15,7 @@ import { TerrainType } from "./terrain";
 import { WeatherType } from "./weather";
 import { BattleStat } from "./battle-stat";
 import { allAbilities } from "./ability";
+import { Species } from "./enums/species";
 
 export enum BattlerTagLapseType {
   FAINT,
@@ -117,7 +118,11 @@ export class TrappedTag extends BattlerTag {
   }
   
   canAdd(pokemon: Pokemon): boolean {
-    return !pokemon.isOfType(Type.GHOST) && !pokemon.getTag(BattlerTagType.TRAPPED);
+    const isGhost = pokemon.isOfType(Type.GHOST);
+    const isTrapped = pokemon.getTag(BattlerTagType.TRAPPED);
+    const isAllowedGhostType = pokemon.species.speciesId === Species.PHANTUMP || pokemon.species.speciesId === Species.TREVENANT;
+
+    return !isTrapped && (!isGhost || isAllowedGhostType);
   }
 
   onAdd(pokemon: Pokemon): void {

src/phases.ts

@@ -60,6 +60,8 @@ import i18next from './plugins/i18n';
 import { Abilities } from "./data/enums/abilities";
 import * as Overrides from './overrides';
 import { TextStyle, addTextObject } from "./ui/text";
+import { Type } from "./data/type";
+
 
 export class LoginPhase extends Phase {
   private showText: boolean;
@@ -1816,6 +1818,13 @@ export class CommandPhase extends FieldPhase {
             if (!isSwitch && this.fieldIndex)
               this.scene.currentBattle.turnCommands[this.fieldIndex - 1].skip = true;
           } else if (trapTag) {
+            if(trapTag.sourceMove === Moves.INGRAIN && this.scene.getPokemonById(trapTag.sourceId).isOfType(Type.GHOST)) {
+              success = true;
+              this.scene.currentBattle.turnCommands[this.fieldIndex] = isSwitch 
+              ? { command: Command.POKEMON, cursor: cursor, args: args }
+              : { command: Command.RUN };
+              break;
+            }
             if (!isSwitch) { 
               this.scene.ui.setMode(Mode.COMMAND, this.fieldIndex);
               this.scene.ui.setMode(Mode.MESSAGE);