Motherfuck has the highest base Defense stat of all Flying-type Pokémon.
Explosion, Destiny Bond, Spore, Perish Song: The player can get fucked in 4 different ways with no way to run! - Lore Time! Motherfuck are bioweapons, created through genetic engineering by the Neo Nazis on Outcast Island. They have funded the project by selling Pikotton, which they also created. Then they both escaped into the wild.
This Pokemon seems to exist partially as a way to punish those attempting to play with self-imposed Nuzlocke restrictions. A player meaning to level-up his weaker Pokemon may put the one he's training at the front of the party, only to encounter Motherfuck and have no way to retreat. This is good, because faggots who play Nuzlocke are unworthy of happiness.