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What will you do with a 40 IV shinny Magikarp?
Just got it for the first time, after 2000 times seen magikarp on pokedex
her IV around 30-40, and 115 CP
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Answers
1) When you fight gyms, if you are not going to need all six attackers, select your golden karp in sixth spot. This will build up its "battles won" number. Then you can put it in a gym and show off in two ways: shiny Magikarp with high battles won.
2) Eventually evolve it and put it in gyms. Maybe fast TM for Dragon Tail, but don't waste any stardust.