Ho Oh

Heavy-Duty Boots rids Ho-Oh of its most crippling flaw, its Stealth Rock weakness, making it a critical defensive Pokemon in the metagame. Thanks to Regenerator, its huge Special Defense, and its good defensive typing, Ho-Oh is an important glue Pokemon for teambuilding, as it compresses a myriad of roles into one. Ho-Oh is able to check Xerneas lacking Ingrain and Marshadow without a Rock-type move and act as a great backup check to Calyrex-S. It is able to consistently switch into Necrozma-DM, the most common Stealth Rock setter in the tier, and use Defog, giving its team good entry hazard control. Offensively, Ho-Oh is no slouch either, as the Choice Band set is underprepared for and is able to punch serious holes into the vast majority of teams. Ho-Oh has become such a metagame-defining force that it's often specifically prepared for in teambuilding; Ho-Oh's massive weakness to Rock-type attacks can be easy to exploit, and it must constantly be on the lookout for Knock Off and Toxic users.