[Misc] Allow setting daily boss variant via custom seed (#6714)

* Add option to set shiny boss

* Update src/data/daily-run.ts

Co-authored-by: Bertie690 <136088738+Bertie690@users.noreply.github.com>

src/data/daily-run.ts

@@ -6,6 +6,7 @@ import { BiomeId } from "#enums/biome-id";
 import { MoveId } from "#enums/move-id";
 import { PartyMemberStrength } from "#enums/party-member-strength";
 import { SpeciesId } from "#enums/species-id";
+import type { Variant } from "#sprites/variant";
 import type { Starter, StarterMoveset } from "#types/save-data";
 import { isBetween, randSeedGauss, randSeedInt, randSeedItem } from "#utils/common";
 import { getEnumValues } from "#utils/enums";
@@ -283,6 +284,31 @@ export function getDailyEventSeedBoss(seed: string): PokemonSpeciesForm | null {
   return starterForm;
 }
 
+/**
+ * Expects the seed to contain `/boss\d{4}\d{2}\d{2}/`
+ * where the first 4 digits are the species ID, the next 2 digits are the form index, and the last 2 digits are the variant.
+ * Only the last 2 digits matter for the variant, and it is clamped to 0-2.
+ * (left padded with `0`s as necessary).
+ * @returns A {@linkcode Variant} to be used for the boss, or `null` if no valid match.
+ */
+export function getDailyEventSeedBossVariant(seed: string): Variant | null {
+  if (!isDailyEventSeed(seed)) {
+    return null;
+  }
+
+  const match = /boss\d{6}(\d{2})/g.exec(seed);
+  if (!match || match.length !== 2) {
+    return null;
+  }
+
+  const variant = Number.parseInt(match[1]) as Variant;
+  if (variant > 2) {
+    return null;
+  }
+
+  return variant;
+}
+
 /**
  * Expects the seed to contain `/biome\d{2}/` where the 2 digits are a biome ID (left padded with `0` if necessary).
  * @returns The biome to use or `null` if no valid match.

src/field/pokemon.ts

@@ -39,7 +39,7 @@ import {
   TrappedTag,
   TypeImmuneTag,
 } from "#data/battler-tags";
-import { getDailyEventSeedBoss } from "#data/daily-run";
+import { getDailyEventSeedBoss, getDailyEventSeedBossVariant } from "#data/daily-run";
 import { allAbilities, allMoves } from "#data/data-lists";
 import { getLevelTotalExp } from "#data/exp";
 import {
@@ -6387,8 +6387,13 @@ export class EnemyPokemon extends Pokemon {
         this.initShinySparkle();
       }
 
+      const eventBossVariant = getDailyEventSeedBossVariant(globalScene.seed);
+      if (eventBossVariant != null && globalScene.gameMode.isWaveFinal(globalScene.currentBattle.waveIndex)) {
+        this.shiny = true;
+      }
+
       if (this.shiny) {
-        this.variant = this.generateShinyVariant();
+        this.variant = eventBossVariant ?? this.generateShinyVariant();
         if (Overrides.ENEMY_VARIANT_OVERRIDE !== null) {
           this.variant = Overrides.ENEMY_VARIANT_OVERRIDE;
         }