[Hotfix] Fix Eternatus egg tier (#4734)

package-lock.json

@@ -1,12 +1,12 @@
 {
 	"name": "pokemon-rogue-battle",
-	"version": "1.1.1",
+	"version": "1.1.2",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "pokemon-rogue-battle",
-			"version": "1.1.1",
+			"version": "1.1.2",
 			"hasInstallScript": true,
 			"dependencies": {
 				"@material/material-color-utilities": "^0.2.7",

package.json

@@ -1,7 +1,7 @@
 {
 	"name": "pokemon-rogue-battle",
 	"private": true,
-	"version": "1.1.1",
+	"version": "1.1.2",
 	"type": "module",
 	"scripts": {
 		"start": "vite",

src/data/balance/species-egg-tiers.ts

@@ -497,7 +497,7 @@ export const speciesEggTiers = {
   [Species.DREEPY]: EggTier.RARE,
   [Species.ZACIAN]: EggTier.LEGENDARY,
   [Species.ZAMAZENTA]: EggTier.LEGENDARY,
-  [Species.ETERNATUS]: EggTier.COMMON,
+  [Species.ETERNATUS]: EggTier.LEGENDARY,
   [Species.KUBFU]: EggTier.EPIC,
   [Species.ZARUDE]: EggTier.EPIC,
   [Species.REGIELEKI]: EggTier.EPIC,

src/data/egg.ts

@@ -544,11 +544,15 @@ export class Egg {
   ////
 }
 
-export function getLegendaryGachaSpeciesForTimestamp(scene: BattleScene, timestamp: number): Species {
-  const legendarySpecies = Object.entries(speciesEggTiers)
+export function getValidLegendaryGachaSpecies() : Species[] {
+  return Object.entries(speciesEggTiers)
     .filter(s => s[1] === EggTier.LEGENDARY)
     .map(s => parseInt(s[0]))
-    .filter(s => getPokemonSpecies(s).isObtainable());
+    .filter(s => getPokemonSpecies(s).isObtainable() && s !== Species.ETERNATUS);
+}
+
+export function getLegendaryGachaSpeciesForTimestamp(scene: BattleScene, timestamp: number): Species {
+  const legendarySpecies = getValidLegendaryGachaSpecies();
 
   let ret: Species;
 

src/test/eggs/egg.test.ts

@@ -1,4 +1,7 @@
-import { Egg, getLegendaryGachaSpeciesForTimestamp } from "#app/data/egg";
+import { speciesEggTiers } from "#app/data/balance/species-egg-tiers";
+import { speciesStarterCosts } from "#app/data/balance/starters";
+import { Egg, getLegendaryGachaSpeciesForTimestamp, getValidLegendaryGachaSpecies } from "#app/data/egg";
+import { allSpecies } from "#app/data/pokemon-species";
 import { EggSourceType } from "#app/enums/egg-source-types";
 import { EggTier } from "#app/enums/egg-type";
 import { VariantTier } from "#app/enums/variant-tier";
@@ -64,6 +67,12 @@ describe("Egg Generation Tests", () => {
     expect(gachaSpeciesCount).toBeGreaterThan(0.4 * EGG_HATCH_COUNT);
     expect(gachaSpeciesCount).toBeLessThan(0.6 * EGG_HATCH_COUNT);
   });
+  it("should never be allowed to generate Eternatus via the legendary gacha", () => {
+    const validLegendaryGachaSpecies = getValidLegendaryGachaSpecies();
+    expect(validLegendaryGachaSpecies.every(s => speciesEggTiers[s] === EggTier.LEGENDARY)).toBe(true);
+    expect(validLegendaryGachaSpecies.every(s => allSpecies[s].isObtainable())).toBe(true);
+    expect(validLegendaryGachaSpecies.includes(Species.ETERNATUS)).toBe(false);
+  });
   it("should hatch an Arceus. Set from species", () => {
     const scene = game.scene;
     const expectedSpecies = Species.ARCEUS;
@@ -376,4 +385,23 @@ describe("Egg Generation Tests", () => {
     expect(diffShiny).toBe(true);
     expect(diffAbility).toBe(true);
   });
+
+  // For now, we are using this test to detect oversights in egg tiers.
+  // Delete this test if the balance team rebalances species costs independently of egg tiers.
+  it("should have correct egg tiers based on species costs", () => {
+    const getExpectedEggTier = (starterCost) =>
+      starterCost <= 3 ? EggTier.COMMON
+        : starterCost <= 5 ? EggTier.RARE
+          : starterCost <= 7 ? EggTier.EPIC
+            : EggTier.LEGENDARY;
+
+    allSpecies.forEach(pokemonSpecies => {
+      const rootSpecies = pokemonSpecies.getRootSpeciesId();
+      const speciesCost = speciesStarterCosts[rootSpecies];
+      const expectedEggTier = getExpectedEggTier(speciesCost);
+      const actualEggTier = speciesEggTiers[rootSpecies];
+
+      expect(actualEggTier).toBe(expectedEggTier);
+    });
+  });
 });