NodeCraft
Silver Bottle Cap
From Pixelmon Wiki
The Silver Bottle Cap is an item that maxes out one of the six stats (HP, Attack, Defense, Special Attack, Special Defense and Speed) of a Pokémon. When you right click a Pokémon with it, you will be able to select what stat do you want to max.
The Silver Bottle Cap is obtainable via fishing and as a tier 3 Special drop.
Bottle caps don't affect the type of Hidden power and it doesn't affect breeding.
