Implement mega evolutions

src/system/achv.ts

@@ -109,12 +109,13 @@ export const achvs = {
   _10000_DMG: new DamageAchv('One Punch Man', 10000, 'lucky_punch_master', 100).setSecret(true),
   _250_HEAL: new HealAchv('Novice Healer', 250, 'potion', 10),
   _1000_HEAL: new HealAchv('Big Healer', 1000, 'super_potion', 25).setSecret(true),
-  _2500_HEAL: new HealAchv('Cleric', 2500, 'hyper_potion', 500).setSecret(true),
+  _2500_HEAL: new HealAchv('Cleric', 2500, 'hyper_potion', 50).setSecret(true),
   _10000_HEAL: new HealAchv('Recovery Master', 10000, 'max_potion', 100).setSecret(true),
   LV_100: new LevelAchv('But Wait, There\'s More!', 50, 'rare_candy', 25).setSecret(),
   LV_250: new LevelAchv('Elite', 250, 'rarer_candy', 50).setSecret(true),
   LV_1000: new LevelAchv('To Go Even Further Beyond', 1000, 'candy_jar', 100).setSecret(true),
   TRANSFER_MAX_BATTLE_STAT: new Achv('Teamwork', 'Baton pass to another party member with at least one stat maxed out', 'stick', 20),
+  MEGA_EVOLVE: new Achv('Megamorph', 'Mega evolve a Pokémon', 'mega_bracelet', 50),
   SPLICE: new Achv('Infinite Fusion', 'Splice two Pokémon together with DNA Splicers', 'dna_splicers', 10),
   MINI_BLACK_HOLE: new ModifierAchv('A Hole Lot of Items', 'Acquire a Mini Black Hole', 'mini_black_hole', 25, modifier => modifier instanceof TurnHeldItemTransferModifier).setSecret(),
   CATCH_LEGENDARY: new Achv('Legendary', 'Catch a legendary Pokémon', 'mb', 50).setSecret(),