From Bulbapedia, the community-driven Pokémon encyclopedia.
Mega Drain (Japanese: メガドレイン Mega Drain) is a Grass-type move introduced in Generation I that deals a small amount of damage. Mega Drain is the second in a line of three Grass draining attacks, the other two being Absorb and Giga Drain.
Mega Drain does damage, and up to 50% of the damage done to the opponent is restored to the user. However, if this attack does 1 point of damage, 1 HP will be restored to the user.
If Mega Drain breaks a Substitute, no HP will be restored to the user. If HP is restored to the user when its current HP is greater than its maximum HP, its current HP will be set equal to its maximum HP.
In Pokémon Stadium, Mega Drain will always miss if the opponent has a substitute.
In Generation III and IV, if the opponent has the Liquid Ooze ability, the user takes damage instead.
In the anime
Budew. Budew's bud glows white. A greenish beam then comes out and hits then opponent. The opponent and beam then glow red. The beam then goes back to the user and the user glows and gets healed.
In other languages
Spanish: Megaagotar, French: Mega-sangsue, German: Megasauger.
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