Feebas have brown skin and blue fins on its sides and on the top of its head too. There is also a fin on the back of this Pokémon. They resemble Magikarp. They look like cookies.
Feebas have the special ability Swift Swim. This increases Feebas' Speed when it is raining. Feebas are considered the ugliest and weakest Pokémon in the Hoenn and Sinnoh regions. Unlike Magikarp, Feebas can learn TMs and HMs. Feebas was meant to be the weakest Pokémon.
Feebas evolves into Milotic when its Beauty stat reaches the maximum. In order to do that, the trainer would need to feed it beauty poffins to increase it's beauty stat. It will still need to level up. In Pokémon Black and White as well as X and Y, Feebas evolves by being traded holding the item Prism Scale.
Feebas has similarities to Magikarp. Both are known as the Fish Pokémon, both know the same level up moves, both have the same stats, and both evolve into a serpentine Pokémon.
Feebas is the first and only Pokémon so far to change its method of evolution from one generation to another.
Feebas probably got its name from the word "Feeble" probably because of its low stats, and "bass".
Feebas appears to be based on a bass and on the tale of The Ugly Duckling on whom first is ugly, but then turns out to be a beautiful swan which is much like Feebas evolves into Milotic which is considered the most beautiful Pokémon ever.