Feebas

Feebas (ヒンバス Hinbass) is a -type Pokémon. It can evolve into Milotic when its Beauty stat reaches a certain point.

Appearance
Feebas have brown skin and blue fins. They resemble Magikarp.

Special Abilities
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 region. Unlike Magikarp, Feebas can learn TMs and HMs.

Location
Pokémon Ruby/Sapphire/Emerald

Feebas is an extremely rare Pokémon found on the water bodies in Route 119 using a rod. In order to increase the rate, it is recommended to use a Super Rod to fish out this Pokémon.

Pokémon Diamond/Pearl/Platinum

Feebas is an extremely rare Pokémon, and can only be found in the basement of Mt. Coronet on Diamond/Pearl. In a body of water in the Mt. Coronet base, there are only 4 tiles where you can fish using the Super Rod and successfully find a Feebas. These tiles change day by day and are not necessarily in a small 4x4 square. You can only catch it using a Super Rod.

In Pokémon Platinum you can use a Good Rod while using Surf on a Pokémon. You have to just fish a few times and catch it with a Poké Ball.

You don't use a Good Rod in Pokémon Platinum, you use an Old Rod. You'll have a better chance with an Old Rod than Good Rod and also in Platinum they are found at Mt.Coronet [upper] B1F.