Leech Life 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 Leech Life 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.
Leech Life will now properly heal the user when damaging a substitute, even if it was broken. If the target has the AbilityLiquid Ooze, the user takes damage instead of restoring HP.
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.
Generation VI
Leech Life cannot be used if the user is under the effects of Heal Block.
Generation VII
Leech Life's power was quadrupled from 20 to 80 and its PP was changed from 15 to 10.
Leech Life inflicts damage and restores the user's HP based on the damage inflicted. In Gates to Infinity and Pokémon Super Mystery Dungeon, ½ of the 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, Leech Life dealing 120 damage to a target with 50 HP will restore 25 HP in Gates to Infinity, but 60 HP in Super Mystery Dungeon.
However, the change also includes a removal from the level-up learnsets of many Pokémon which could learn Leech Life early on in previous generations, with Absorb taking its place instead.