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A Pokémon holding this item gains 4 Special AttackEVs whenever it gains experience in battle (EVs are awarded for each Pokémon knocked out in Horde Battles despite experience being gained all at once); its effect is doubled by Pokérus. (In Generation IV, level 100 Pokémon cannot gain EVs in battle; from Generation V onward, they gain EVs whenever they would earn experience.)
The Speed stat of the Pokémon holding this item is halved in battle.
Generation VII onwards
A Pokémon holding this item now gains 8 Special AttackEVs instead of 4 whenever it gains experience during battle.