Magikarp is a very strong Pokemon found in rivers, lakes, oceans, the toilet, and your back yard pond.. To obtain one, you can trade or fish. They evolve into fishy butt at level 20.
Magikarp is most notable for being the stronkest Pokemon in the game until you evolve it. In many of the Pokemon games, the Pokedex entries usually say something along the lines of how stronk it is. It can only learn PRISMATIC CRYSTAL AND FART POO.