Kangaskhan

Kangaskhan is a Pokemon that's kinda out there in no man's land. Its stats are incredibly well-rounded and proportioned quite nicely. Its Speed is surprisingly nice for a huge Mongolian kangaroo and it can finish off Pokemon with a lower Speed than 278. It is capable of sweeping a team with no trouble at all without a real fear of being phazed. After a few Curses, even Skarmory and Rhydon aren't going to be able to be much worry for Kangaskhan. The other big thing with Kangaskhan is its ability to put up with special attacks too. It can survive 3 Thunderbolts from Raikou, meaning if it Cursed up and Rested on a Raikou switch-in, it could survive the Rest to KO it. Kangaskhan's just not hard to use at all. However, due to the presence of Snorlax, it quietly remains in the shadow of BL. Since Ghost-types can completely mess up Kangaskhan, you may want to use it with Spikes and/or something with Pursuit to rub out said Ghosts, assuming you want to use Roar over Earthquake.