you can get in a double battle and win to level up magikarp
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Simply level it up to 20.
In Pokémon Ruby, Magikarp evolves into Gyarados at level 20. Magikarp that have been caught at a level higher than Level 20 will evolve the next time they level up as long as they're not holding an Everstone which is an item that prevents evolution.
Level up to level 20 if male if female you get one of the other three.
there is no good Pokemon and bad Pokemon its just the way You level it up and what moves it knows /execpt Magikarp they cant learn moves but Gyrados is worth it at the end.
If you are going to evolve a Magickarp in Pokemon Platinum you need to: 1. Go and find yourself a MagicKarp(of course if your going to evolve a MagicKarp) 2.level up that MagicKarp to lvl 20 and then it evolves.( It will learn how to use bite when it evolves). P.S I hoped this helped you!