diff --git a/src/data/ability.ts b/src/data/ability.ts
index 95bb6b8d54e..f8c26f9e516 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -2865,7 +2865,7 @@ export class PreSetStatusEffectImmunityAbAttr extends PreSetStatusAbAttr {
    * @returns A boolean indicating the result of the status application.
    */
   applyPreSetStatus(pokemon: Pokemon, passive: boolean, simulated: boolean, effect: StatusEffect, cancelled: Utils.BooleanHolder, args: any[]): boolean {
-    if (this.immuneEffects.length < 1 || this.immuneEffects.includes(effect)) {
+    if (effect !== StatusEffect.FAINT && this.immuneEffects.length < 1 || this.immuneEffects.includes(effect)) {
       cancelled.value = true;
       return true;
     }
diff --git a/src/data/balance/biomes.ts b/src/data/balance/biomes.ts
index 240881ad580..8913fd47e93 100644
--- a/src/data/balance/biomes.ts
+++ b/src/data/balance/biomes.ts
@@ -102,6 +102,18 @@ export interface BiomePokemonPools {
   [key: integer]: BiomeTierPokemonPools
 }
 
+export interface BiomeTierTod {
+  biome: Biome,
+  tier: BiomePoolTier,
+  tod: TimeOfDay[]
+}
+
+export interface CatchableSpecies{
+  [key: integer]: BiomeTierTod[]
+}
+
+export const catchableSpecies: CatchableSpecies = {};
+
 export interface BiomeTierTrainerPools {
   [key: integer]: TrainerType[]
 }
@@ -7716,6 +7728,9 @@ export function initBiomes() {
       uncatchableSpecies.push(speciesId);
     }
 
+    // array of biome options for the current species
+    catchableSpecies[speciesId] = [];
+
     for (const b of biomeEntries) {
       const biome = b[0];
       const tier = b[1];
@@ -7725,6 +7740,12 @@ export function initBiomes() {
           : [ b[2] ]
         : [ TimeOfDay.ALL ];
 
+      catchableSpecies[speciesId].push({
+        biome: biome as Biome,
+        tier: tier as BiomePoolTier,
+        tod: timesOfDay as TimeOfDay[]
+      });
+
       for (const tod of timesOfDay) {
         if (!biomePokemonPools.hasOwnProperty(biome) || !biomePokemonPools[biome].hasOwnProperty(tier) || !biomePokemonPools[biome][tier].hasOwnProperty(tod)) {
           continue;
diff --git a/src/data/balance/passives.ts b/src/data/balance/passives.ts
index 60b50c7909c..f28b8bbdeea 100644
--- a/src/data/balance/passives.ts
+++ b/src/data/balance/passives.ts
@@ -1,7 +1,15 @@
 import { Abilities } from "#app/enums/abilities";
 import { Species } from "#app/enums/species";
 
-export const starterPassiveAbilities = {
+export interface PassiveAbilities {
+  [key: number]: Abilities
+}
+
+interface StarterPassiveAbilities {
+  [key: integer]: PassiveAbilities
+}
+
+export const starterPassiveAbilities: StarterPassiveAbilities = {
   [Species.BULBASAUR]: { 0: Abilities.GRASSY_SURGE },
   [Species.CHARMANDER]: { 0: Abilities.BEAST_BOOST },
   [Species.SQUIRTLE]: { 0: Abilities.STURDY },
diff --git a/src/data/balance/tms.ts b/src/data/balance/tms.ts
index da900768987..e44f7bf44bf 100644
--- a/src/data/balance/tms.ts
+++ b/src/data/balance/tms.ts
@@ -68433,6 +68433,46 @@ export const tmSpecies: TmSpecies = {
   ],
 };
 
+interface SpeciesTmMoves {
+  [key: integer]: (Moves | [string | Species, Moves])[];
+}
+
+function transposeTmSpecies(): SpeciesTmMoves {
+  const flipped: SpeciesTmMoves = {};
+
+  for (const move in tmSpecies) {
+    const moveKey = Number(move);
+    const speciesList = tmSpecies[move];
+
+    for (const species of speciesList) {
+
+      if (Array.isArray(species)) {
+        // Extract base species and all associated forms
+        const [ baseSpecies, ...forms ] = species;
+        const speciesKey = Number(baseSpecies);
+
+        if (!flipped[speciesKey]) {
+          flipped[speciesKey] = [];
+        }
+
+        for (const form of forms) {
+          flipped[speciesKey].push([ form, moveKey ]);
+        }
+
+      } else {
+        const speciesKey = Number(species);
+        if (!flipped[speciesKey]) {
+          flipped[speciesKey] = [];
+        }
+        flipped[speciesKey].push(moveKey);
+      }
+    }
+  }
+  return flipped;
+}
+
+export const speciesTmMoves: SpeciesTmMoves = transposeTmSpecies();
+
 interface TmPoolTiers {
     [key: integer]: ModifierTier
 }
diff --git a/src/test/abilities/shields_down.test.ts b/src/test/abilities/shields_down.test.ts
index 6ffc28c37ab..ca6d945824e 100644
--- a/src/test/abilities/shields_down.test.ts
+++ b/src/test/abilities/shields_down.test.ts
@@ -189,4 +189,19 @@ describe("Abilities - SHIELDS DOWN", () => {
     }
   );
 
+  test("should not prevent minior from receiving the fainted status effect in trainer battles", async () => {
+    game.override.enemyMoveset([ Moves.TACKLE ]);
+    game.override.moveset([ Moves.THUNDERBOLT ]);
+    game.override.startingLevel(100);
+    game.override.startingWave(5);
+    game.override.enemySpecies(Species.MINIOR);
+    await game.classicMode.startBattle([ Species.REGIELEKI ]);
+    const minior = game.scene.getEnemyPokemon()!;
+
+    game.move.select(Moves.THUNDERBOLT);
+    await game.toNextTurn();
+    expect(minior.isFainted()).toBe(true);
+    expect(minior.status?.effect).toBe(StatusEffect.FAINT);
+  });
+
 });