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Silver Bottle Cap
From Pixelmon Wiki
The Silver Bottle Cap is an item that increases one of the six stats (HP, Attack, Defense, Special Attack, Special Defense, and Speed) of a maximum level Pokémon to act as if it had a perfect IV. When you right-click a maximum level Pokémon with it, you will be able to select what stat you want to increase.
Silver Bottle Caps are obtainable via fishing, as a drop from 3-5 star Max Raid Battles and as a tier 3 Special drop.
Bottle caps only affect the IVs for battling purposes. It doesn't affect the type of Hidden power and it doesn't affect breeding.
