Ludicolo

Ludicolo is a very dangerous Pokemon to face in the rain. It has solid Special Attack, allowing it to be a fearsome sweeper. It also has very good special bulk, allowing it to take special hits well. Even its Attack is decent, meaning it can surprise many of its counters with either Focus Punch on a special set, or by going all out with a Swords Dance set. Being able to handle almost all Water-types is not something many Pokemon can boast, so Ludicolo makes a great option for any Rain Dance team.

Ludicolo can't cover everything in one set and so will always have problems with some Pokemon; however, with adequate support, it can get past these barriers and be a menace to your opponent's team. Its ability Swift Swim means almost no Pokemon, barring Choice Scarf users, can outspeed it, helping it sweep even more easily.