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Power Weight
From Pixelmon Wiki
A Power Weight is a type of power item. When the holder of this item defeats any Pokémon, it will gain 8 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. It can be obtained as a tier 3 special drop. It is a possible drop from rare boss Pokémon.
