Regirock

Though Regirock faces challenges in distinguishing itself in the Balanced Hackmons metagame, its stats and typing combine to provide it with a niche as a bulky pivot. Its Rock typing can initially appear to be a curse in a metagame infested with Thousand Arrows and other attacks that prey on the type's weaknesses. However, the typing also sports key resistances to Flying and Fire, which notably allows Regirock to take Aerilate-boosted attacks with ease. This, combined with Regirock's 80 / 200 physical bulk to absorb Thousand Arrows, means that it sports the ability to comfortably check Mega Rayquaza, as well as countering other threats like Ho-Oh. Regirock's Rock typing also grants it STAB on Diamond Storm, allowing it to apply offensive pressure on a variety of top-tier threats while operating in its defensive capacities. Unfortunately, it faces stiff competition from Mega Tyranitar and Mega Diancie offensively and from Registeel and other bulky Steel-types defensively. Overall, however, Regirock is an excellent pivot that can help teams cover key weaknesses to prominent offensive threats while maintaining momentum.