| Type | grass |
| Category | Special |
| Power | 75 |
| Accuracy | 100 |
| PP | 10 |
| Introduced | Generation 2 |
Giga 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, Giga Drain turns into Bloom Doom and has base power 140.
| Gold Silver Crystal | Steals 1/2 of the damage inflicted. |
| Ruby Sapphire Emerald | An attack that steals half the damage inflicted. |
| FireRed LeafGreen | A harsh attack that absorbs 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 | 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 | Giga Drain |
|---|---|
| Spanish | Gigadrenado |
| Italian | Gigassorbimento |
| Japanese | ギガドレイン (Giga Drain) |
| German | Gigasauger |
| French | Giga-Sangsue |