Leech Seed (move)

Effects
Leech Seed plants a seed on the target. 1/8 of its HP will be drained (rounded down, but not less than 1) at the end of its turn, and the same amount of HP will be restored to the target's opponent (even if it was not the Pokémon that originally used the attack). Recurrent Leech Seed draining will not occur if the seeded Pokémon defeats the target. Leech Seed will not work against Grass-type Pokémon, and attempts to seed an already-seeded Pokémon will fail.

Leech Seed draining will occur even if the seeded Pokémon knocks itself out with crash damage, recoil damage, or self-inflicted confusion damage, or by making a substitute before the end of its turn. Draining from Leech Seed is done after continuing partial trapping damage and recurrent poison or burn damage. Leech Seed can be removed by switching.

Rapid Spin will release a Pokémon from the effects of Leech Seed. If a Pokémon uses Baton Pass, Leech Seed will still be in effect, even if the switched in Pokémon is a Grass type. The user cannot plant a seed on a target with a substitute but setting up a substitute does not release a Pokémon from existing effects of Leech Seed.

If the target has the Ability Liquid Ooze, the user takes damage instead of restoring HP. If the user is under the effect of Heal Block, Leech Seed will not restore any of the user's HP. However, the effect damage will be dealt normally. If the user has a Big Root as its held item, it will recover 30% more HP than it normally would. Big Root does not increase damage dealt. All other effects remain the same.