How do you get a Magikarp that knows bounce?

you need the pokewalker course:Winner's Path. Its available until June 25, 2010. just go to mystery gift, receive via wifi/wfc, and wait! you just walk enough to get ten watts so you can catch a Pokemon, and youll usually find magikarps knowing bounce. you can also find munchlax knowing selfdestruct, horsea knowing muddy water, duskull knowing impriosn, beldum knowing zen headbutt, and bronzor knowing trick ROM i think. its stupid cuz all of the moves that they have are egg moves or level up moves or tms except selfdestruct

bounce-egg

muddy water-egg

zen headbutt-learns as metang

trick room-TM

imprison-egg