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Gold Bottle Cap
From Pixelmon Wiki
The Gold Bottle Cap is an item that maxes out all the stats of a level 100 Pokémon. Right-clicking a level 100 Pokémon with this item, every stat (HP, Attack, Defense, Special Attack, Special Defense and Speed) will be maxed out.
The Gold Bottle Cap is obtainable via fishing only.
Bottle caps only affect the ivs for battling purposes. It doesn't affect the type of Hidden power and it doesn't affect breeding.
