Diancie

Diancie's ability to wall many metagame staples and support its team through other useful ways solidly places it at the top of the metagame. It can defensively answer many hard-to-wall wallbreakers such as Exploud and Salazzle and can pivot around other threats like Tauros and Guzzlord. It's also a fantastic Stealth Rock setter by virtue of its good matchup against many of NU's common entry hazard removers and one of a select few clerics available. However, Diancie's great defensive potential is limited by the litany of wallbreakers that can switch into it and easily take it down, such as Starmie and Golurk. Additionally, many Pokemon can lure in and take out or heavily damage Diancie with coverage moves, in particular Iron Head Tauros and Braviary and Hydro Pump Exploud, further restricting its capabilities.