[Bug] Fix game freeze from GTS infinite loop

src/data/mystery-encounters/encounters/global-trade-system-encounter.ts

@@ -431,14 +431,13 @@ function getPokemonTradeOptions(scene: BattleScene): Map<number, EnemyPokemon[]>
 
 function generateTradeOption(alreadyUsedSpecies: PokemonSpecies[], originalBst?: number): PokemonSpecies {
   let newSpecies: PokemonSpecies | undefined;
+  let bstCap = 9999;
+  let bstMin = 0;
+  if (originalBst) {
+    bstCap = originalBst + 100;
+    bstMin = originalBst - 100;
+  }
   while (isNullOrUndefined(newSpecies)) {
-    let bstCap = 9999;
-    let bstMin = 0;
-    if (originalBst) {
-      bstCap = originalBst + 100;
-      bstMin = originalBst - 100;
-    }
-
     // Get all non-legendary species that fall within the Bst range requirements
     let validSpecies = allSpecies
       .filter(s => {

src/test/mystery-encounter/encounters/global-trade-system-encounter.test.ts

@@ -69,6 +69,20 @@ describe("Global Trade System - Mystery Encounter", () => {
     expect(GlobalTradeSystemEncounter.options.length).toBe(4);
   });
 
+  it("should not freeze when generating trade options for extreme BST non-legendaries", async () => {
+    const extremeBstTeam = [Species.SLAKING, Species.WISHIWASHI, Species.SUNKERN];
+    await game.runToMysteryEncounter(MysteryEncounterType.GLOBAL_TRADE_SYSTEM, extremeBstTeam);
+
+    expect(GlobalTradeSystemEncounter.encounterType).toBe(MysteryEncounterType.GLOBAL_TRADE_SYSTEM);
+    expect(GlobalTradeSystemEncounter.encounterTier).toBe(MysteryEncounterTier.COMMON);
+    expect(GlobalTradeSystemEncounter.dialogue).toBeDefined();
+    expect(GlobalTradeSystemEncounter.dialogue.intro).toStrictEqual([{ text: `${namespace}.intro` }]);
+    expect(GlobalTradeSystemEncounter.dialogue.encounterOptionsDialogue?.title).toBe(`${namespace}.title`);
+    expect(GlobalTradeSystemEncounter.dialogue.encounterOptionsDialogue?.description).toBe(`${namespace}.description`);
+    expect(GlobalTradeSystemEncounter.dialogue.encounterOptionsDialogue?.query).toBe(`${namespace}.query`);
+    expect(GlobalTradeSystemEncounter.options.length).toBe(4);
+  });
+
   it("should not spawn outside of CIVILIZATION_ENCOUNTER_BIOMES", async () => {
     game.override.mysteryEncounterTier(MysteryEncounterTier.COMMON);
     game.override.startingBiome(Biome.VOLCANO);