fish for a long time with a super rod in resort area and it will come out. p.s to the swimmer it is a monster!
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It's a level 100 Magikarp.
In Pokemon Platinum, go to the Resort Area (South of Route 229) and use the Super Rod in the pond by your villa. There's a small chance you can get a rare, wild level 100 Magikarp. (The level ranges from 1 to 100.)
Your best bet would be to use the "all Pokemon shiny" code for your game then go fishing in the Resort Area for the level 100 Magikarp that can be caught there. In Platinum, that is.
he is talking about a lvl 100 magikarp in the pond (super rod)
it is a level 100 magikarp, and i think its shining, but you should get one of the 99s, give him a rare candy, and you've got a lvl 100 gyrados