There is no way of doing that unless hacking, such as using an Action Replay.
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It's a level 100 Magikarp.
You cannot catch level 100 Pokémon, but you can battle them at the battle frontier.
What are you trying to ask?
level 100 or he will own you instantly if you have a grass type your dead
evolve alakazam from kadabra in level 100. just kiding at level 45