Zekrom

Zekrom's high offensive capabilities combined with its anti-meta STAB combination allow it to consistently beat standard sets of common defensive Pokemon such as Giratina, Registeel, Zygarde-C, and Primal Kyogre. Also, its resistance to Flying and Steel combined with its bulk allows it to stay in on various offensive Pokemon such as Kartana and offensive Necrozma-DM lacking Precipice Blades. Due to these factors as well as Zekrom being the most viable Electric-type in BH, Zekrom finds a niche as an anti-meta Pokemon that can capitalize on most teams not having a reliable way to beat it.

However, despite having some great resistances, Dragon is one of the most prepared-for defensive types in the metagame due to the presence of Giratina, Zygarde-C, and Mega Garchomp. As such, Zekrom is frequently hit by Ice- and Fairy-type coverage and revenge killed by -ate users. As most offensive teams will have multiple of these Pokemon, Zekrom finds difficulty in setting up on them. In addition, though uncommon, Ferrothorn and Mega Steelix generally stop Zekrom cold. Zekrom is also unable to run significantly different sets; one check to Zekrom will generally check all of Zekrom's sets. Zekrom can be difficult to Imposter-proof, making it difficult to fit onto a team. Zekrom generally finds itself struggling to sweep if it cannot find an opportunity to set up, as it lacks the sheer power that other Pokemon such as Primal Groudon and Mega Mewtwo X have, making it more difficult to use.