A Power Weight is a held item that gives extra HP EVs when the holder participates in battle.
Obtaining
Crafting
White Mint Leaf
Lime Concrete
Diamond
Lime Concrete
Lime Concrete
Diamond
Lime Concrete
White Mint Leaf
Usage
A Power Weight gives 8 HP EVs in addition the base EV yield of the Pokémon defeated, while halving the Speed stat of the holder.
A Power Weight will guarantee the passing down of the holder's HP IVs to the child when bred. If both parents hold a Power Weight, one parent will be chosen randomly to pass down its HP IV. (not available as of Cobblemon 1.5.2)