Flygon

Flygon is an excellent Pokemon, being one of a meager handful of the dreaded Dragon-types left in OU. Its resistance to Stealth Rock is a major boon in comparison to Dragonite, which takes 25% damage upon switching in. On top of that, Flygon has a plethora of resistances and immunities of which it can take advantage. U-turn is an awesome attack to have on Choice item sets since it makes predicting switches a lot easier. A mixed-attacking set can also be quite devastating with its powerful STAB Dragon- and Ground-type attacks, and it has some other tricks up its sleeve. Overall, Flygon's unique typing, ability, all around solid stats, and its useful movepool make it a great teammate on many different types of builds.