A yellow Magikarp is a "shiny" Magikarp. The odds of finding any Shiny Pokemon is 1 in 8,192. Unless you use an Action Replay code, it will be VERY difficult to find one.
Chat with our AI personalities
Magikarp evolves at level 20.
magikarp evolves at level 20 in all games
these different color Pokemon are called shiny Pokemon, each Pokemon has a double that has a different color, like the "yellow magikarp", if you want one, use the old rod over and over again until you have a shiny magikarp.
You catch Magikarp on route 12.
Its called a shiny it occurs 1/8146 (i think) out of every Pokemon encounter