Show species-specific items in teambuilder

src/battle-dex-data.ts

@@ -970,13 +970,14 @@ class Item implements Effect {
 	readonly zMove: string | true | null;
 	readonly zMoveType: TypeName | '';
 	readonly zMoveFrom: string;
-	readonly zMoveUser: string[] | null;
+	readonly zMoveUser: readonly string[] | null;
 	readonly onPlate: TypeName;
 	readonly onMemory: TypeName;
 	readonly onDrive: TypeName;
 	readonly fling: any;
 	readonly naturalGift: any;
 	readonly isPokeball: boolean;
+	readonly itemUser?: readonly string[];
 
 	constructor(id: ID, name: string, data: any) {
 		if (!data || typeof data !== 'object') data = {};
@@ -1003,6 +1004,7 @@ class Item implements Effect {
 		this.fling = data.fling || null;
 		this.naturalGift = data.naturalGift || null;
 		this.isPokeball = !!data.isPokeball;
+		this.itemUser = data.itemUser;
 
 		if (!this.gen) {
 			if (this.num >= 577) {

src/battle-dex-search.ts

@@ -1052,8 +1052,25 @@ class BattleItemSearch extends BattleTypedSearch<'item'> {
 		}
 		return table.itemSet;
 	}
-	getBaseResults() {
-		return this.getDefaultResults();
+	getBaseResults(): SearchRow[] {
+		if (!this.species) return this.getDefaultResults();
+		const speciesName = this.dex.getSpecies(this.species).name;
+		const results = this.getDefaultResults();
+		const speciesSpecific: SearchRow[] = [];
+		for (const row of results) {
+			if (row[0] !== 'item') continue;
+			if (this.dex.getItem(row[1]).itemUser?.includes(speciesName)) {
+				speciesSpecific.push(row);
+			}
+		}
+		if (speciesSpecific.length) {
+			return [
+				['header', "Specific to " + speciesName],
+				...speciesSpecific,
+				...results,
+			];
+		}
+		return results;
 	}
 	filter(row: SearchRow, filters: string[][]) {
 		if (!filters) return true;