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If a Pokemon uses Absorb, Drain Punch, Dream Eater, Giga Drain, Leech Life, Mega Drain, or Horn Leech on the wielder, the attacker will lose HP equal to half of the damage dealt instead. The wielder will still lose 1/8th of its HP from Leech Seed, but the Pokemon that targeted the wielder will lose the same amount of HP rather than gaining it.
Tentacruel is the only competitive user of Liquid Ooze, and it prefers Rain Dish usually, but you may occasionally find it on Tentacruel in order for it to better deal with Whimsicott, Ferrothorn, and Conkeldurr. It also allows Tentacruel to counter threats such as Calm Mind Virizion much more easily. A decent ability, but generally outclassed by others.
Found in Dream World