Magikarp evolves on level 20 into a gyarados.
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you can also drop it off at the daycare center for a while hey somethings wrong i put it in day care its level 21 and not evolving wut happened Answer: It doesn't evolve by itself in daycare, it will evolve when you level it one level whilst it is in your party.
Get a shiny Magikarp. A Red Gyarados is a shiny Gyarados.
On level 28!!!!
You have to trade it
Level 55.