Regigigas

Regigigas sets itself apart from other Poison Heal users with its mono-Normal typing that grants it an immunity to Spectral Thief and, combined with its solid bulk, provides it with ample opportunities to set up against various foes and take advantage of passive Pokemon in the metagame. Facade threatens all offensive teams after a single boost and generates additional setup opportunities against them. While Normal does not provide good coverage offensively, Regigigas can simply overpower foes that resist Facade by putting them to sleep and setting up multiple boosts. This leaves Regigigas as a notable threat for defensive teams as well, as Unaware users that can take on a boosted Regigigas risk being put to sleep and left vulnerable, while very few foes that run Magic Bounce can take Regigigas's boosted Facade. On top of this, Regigigas is able to easily defeat Imposter users by removing their Eviolite with Knock Off and taking advantage of its status-boosted Facade and pseudo-immunity to sleep-inducing moves that its Imposters are vulnerable to. All of these factors combine to make Regigigas a threat that has very narrow and specific defensive counterplay options that force opponents to react defensively to it, generating predictable moves from foes for Regigigas's teammates to capitalize on. However, Regigigas fails to provide much defensive utility to the team due to its lack of resistances and immunities apart from an immunity to Ghost-type attacks. Also, the prevalence of Core Enforcer and Entrainment means Regigigas's setup opportunities are somewhat limited. Due to the fact that Regigigas is one-dimensional as an offensive threat and requires a dedicated Pokemon to check it, most competitive teams have adapted to its presence and commonly employ checks like Giratina, Fur Coat users, and Steel-types with Magic Bounce, all of which Regigigas struggles to break past.