diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index f1ccbbc17ec..4a21d8bd551 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -1426,7 +1426,7 @@ export default class BattleScene extends SceneBase {
 
   randomSpecies(waveIndex: integer, level: integer, fromArenaPool?: boolean, speciesFilter?: PokemonSpeciesFilter, filterAllEvolutions?: boolean): PokemonSpecies {
     if (fromArenaPool) {
-      return this.arena.randomSpecies(waveIndex, level);
+      return this.arena.randomSpecies(waveIndex, level,null , getPartyLuckValue(this.party));
     }
     const filteredSpecies = speciesFilter ? [...new Set(allSpecies.filter(s => s.isCatchable()).filter(speciesFilter).map(s => {
       if (!filterAllEvolutions) {
diff --git a/src/field/arena.ts b/src/field/arena.ts
index f6390e40db5..9bf8a3eac0a 100644
--- a/src/field/arena.ts
+++ b/src/field/arena.ts
@@ -68,14 +68,20 @@ export class Arena {
     }
   }
 
-  randomSpecies(waveIndex: integer, level: integer, attempt?: integer): PokemonSpecies {
+  randomSpecies(waveIndex: integer, level: integer, attempt?: integer, luckValue?: integer): PokemonSpecies {
     const overrideSpecies = this.scene.gameMode.getOverrideSpecies(waveIndex);
     if (overrideSpecies) {
       return overrideSpecies;
     }
     const isBoss = !!this.scene.getEncounterBossSegments(waveIndex, level) && !!this.pokemonPool[BiomePoolTier.BOSS].length
       && (this.biomeType !== Biome.END || this.scene.gameMode.isClassic || this.scene.gameMode.isWaveFinal(waveIndex));
-    const tierValue = Utils.randSeedInt(!isBoss ? 512 : 64);
+    const randVal = isBoss ? 64 : 512;
+    // luck influences encounter rarity
+    let luckModifier = 0;
+    if (typeof luckValue !== "undefined") {
+      luckModifier = luckValue * (isBoss ? 2 : 0.5);
+    }
+    const tierValue = Utils.randSeedInt(randVal - luckModifier);
     let tier = !isBoss
       ? tierValue >= 156 ? BiomePoolTier.COMMON : tierValue >= 32 ? BiomePoolTier.UNCOMMON : tierValue >= 6 ? BiomePoolTier.RARE : tierValue >= 1 ? BiomePoolTier.SUPER_RARE : BiomePoolTier.ULTRA_RARE
       : tierValue >= 20 ? BiomePoolTier.BOSS : tierValue >= 6 ? BiomePoolTier.BOSS_RARE : tierValue >= 1 ? BiomePoolTier.BOSS_SUPER_RARE : BiomePoolTier.BOSS_ULTRA_RARE;