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When the wielder is at 1/3 HP or less, all of its Water-type moves will have 50% more power.
It has next to no use as an ability these days. None of the Water-type starters get much love these days, except for maybe Blastoise, who would much rather use Rain Dish to heal its health in rain. Swampert has fallen from grace a by quite a bit, arguably being outclassed by Gastrodon and Quagsire in the Water- / Ground-type department. Even so, Empoleon can make use of it in UU thanks to its classic Agility SubPetaya set, which can even be useful in OU with rain support, but suffers from the presence of Mach Punch users such as Breloom and Conkeldurr.
Found in Dream World