You cannot catch level 100 Pokémon, but you can battle them at the battle frontier.
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It's a level 100 Magikarp.
What are you trying to ask?
evolve alakazam from kadabra in level 100. just kiding at level 45
I can only give you a code that has any Pokemon you want lv. 100.
Get a super rod in Pokemon Platinum and then fly to resort area. Fish in the water and Magikarps will come up. The Magikarps are lvls 50-100.