Noah★
Pokémon Ranger
I hate to be the one to say this, but both the Magikarp and all of the legendaries the opponent uses are hacked Pokemon. They're fakes created through programs like PokeGen and PokeSav. The same goes for the Magikarp in the triple battle.
I love it when this guy sweeps people with 'crappy' Pokemon.
Its possible to sweep crappy teams with a Magikarp, but it is very hard to do so. You would need a dedicated Baton Pass team for a real Magikarp to preform a sweep.