Mega Drain is the second in a line of three Grass-type HP draining attacks, the other two being Absorb and Giga Drain.
Generations I and II
Mega Drain inflicts damage, and up to 50% of the damage dealt to the target is restored to the user as HP. If this attack deals 1 HP 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.
Mega Drain will now properly heal the user when damaging a substitute, even if it was broken. If used on a Pokémon with the Liquid Ooze Ability, the user will lose the amount of HP it would have gained instead.
Mega Drain's base PP was increased to 15. If the user is holding a Big Root, the HP restored is increased by 30% (making the restored HP 65% of the damage dealt). Big Root does not increase the damage dealt.
Mega Drain cannot be used if the user is under the effects of Heal Block.
Mega Drain inflicts damage and restores the user's HP based on the damage inflicted. In Gates to Infinity and Pokémon Super Mystery Dungeon, ½ of damage dealt will be restored to the user. In Gates to Infinity, the HP restored will be based off the HP lost by the target, while in Super Mystery Dungeon, the HP restored is based off the overall damage dealt. For example, Mega Drain dealing 120 damage to a target with 50 HP will restore 25 HP in Gates to Infinity, but 60 HP in Super Mystery Dungeon.
Table assumes the user is in the square marked by > facing to the right. Orange squares indicate spaces that are hit. Red squares indicate the knockback on hit Pokémon. A blue square indicates the user's position after performing the move.
Power = 26 | Accuracy = 100% | Effect = Restores the user's HP by half the damage taken by the target.
The bud on Budew's head glows white, and it shoots a dark green beam from its bud at the opponent. The green beam grabs the opponent, traps it inside and sucks its energy. As it does, the opponent becomes outlined in red and the beam turns red. The beam releases the opponent and goes back to Budew. Budew glows white when the beam goes back to it, and all of its injuries disappear.