Zekrom

Zekrom is one of the tier's best wallbreakers, wielding a terrifying Electric / Dragon STAB combination and access to Dragon Dance to further enhance its already great Attack and serviceable Speed. The vast number of Flying- and Dragon-types that dominate the metagame makes Zekrom a very scary prospect for any team without a dedicated answer to it. Moreover, Zekrom can be tailored to beat some of its checks, leaving the opponent to guess what move rounds out its moveset. Zekrom is also a potent stallbreaker thanks to its signature ability, Teravolt, which allows it to break walls such as Multiscale Lugia and Shedinja. However, without a Speed boost, Zekrom is easily outsped and disposed of by the multitude of Fairy- and Dragon-types in the metagame. Even with a Speed boost, it contests with common Choice Scarf users that either Speed tie with it such as Kyogre or outspeed it such as Calyrex-S and Yveltal, and Ditto, all of which OHKO it.