| Type | grass |
| Category | Special |
| Power | 40 |
| Accuracy | 100 |
| PP | 15 |
| Introduced | Generation 1 |
Mega Drain deals damage and the user will recover 50% of the HP drained.
If the user is holding a Big Root, the move instead recovers 65% of the damage dealt (30% more than normal). If used on a Pokémon with the ability Liquid Ooze, the user instead loses the HP it would have otherwise gained.
When a Pokémon is holding Grassium Z and uses its Z-Power, Mega Drain turns into Bloom Doom and has base power 120.
| Gold Silver Crystal | Steals 1/2 of the damage inflicted. |
| Ruby Sapphire Emerald | An attack that absorbs half the damage inflicted. |
| FireRed LeafGreen | A tough attack that drains half the damage it inflicted to restore HP. |
| Diamond Pearl Platinum HeartGold SoulSilver | A nutrient-draining attack. The user’s HP is restored by half the damage taken by the target. |
| Black White Black 2 White 2 | A nutrient-draining attack. The user’s HP is restored by half the damage taken by the target. |
| X Y O.Ruby A.Sapphire | A nutrient-draining attack. The user’s HP is restored by half the damage taken by the target. |
| Sun Moon Ultra Sun Ultra Moon L.G. Pikachu L.G. Eevee | A nutrient-draining attack. The user’s HP is restored by half the damage taken by the target. |
| Sword Shield B.Diamond S.Pearl | A nutrient-draining attack. The user’s HP is restored by half the damage taken by the target. |
| English | Mega Drain |
|---|---|
| Spanish | Megaagotar |
| Italian | Megassorbimento |
| Japanese | メガドレイン (Mega Drain) |
| German | Megasauger |
| French | Méga-Sangsue |