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Power Weight
From Pixelmon Wiki
A Power Weight is a held item that is dropped from boss Pokémon or found in PokéLoot chests. When the holder of this item defeats any Pokémon, it will gain 4 HP EVs in addition to any normal EVs gained from the victory (as long as it has not reached its EV limit). However, the holder's Speed will be halved while holding the Power Weight. When a breeding Pokémon holds a Power Weight, its HP IV is guaranteed to be passed to its offspring.
