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If the wielder is KOed by a contact attack, the attacker takes damage equal to 25% of its maximum HP. Aftermath will not work if there is a Pokemon with Damp on the field.
This ability appears very situational, but in the right circumstances it can be very useful to hurt physical attackers, especially when Life Orb is also depleting their health. While there are many better abilities, the Pokemon that have Aftermath usually have few usable alternatives. The fully evolved Pokemon that have Aftermath are Skuntank and Drifblim (although if playing with Dream World Pokemon, Garbodor and Electrode also gain the ability). Aftermath is one of the factors that make Skuntank in particular a dangerous opponent, so it should under no circumstances be underestimated. The pre-evolutions of the aforementioned Pokemon can also use this ability effectively in Little Cup.
Found in Dream World