Regidrago

Regidrago's access to Dragon Energy paired with its decent Speed and monstrous HP allows it to be a great sweeper late-game while still having utility as a revenge killer mid-game. Regidrago's ability, Dragon's Maw, is amazing, strengthening its already powerful STAB Dragon Energy even further so that it OHKOes threats like Terrakion, Armarouge, and Basculegion-F. While Regidrago has enormous HP and its typing has many useful resistances, aiding it against Pokemon like Volcanion, Raikou, and Armarouge, it can't put either of them to good use, as it needs to conserve its HP to ensure Dragon Energy stays as strong as possible. Additionally, Regidrago's lack of coverage moves forces it to rely on Terastallization to even hit most Fairy-types for good damage. Regidrago is quite slow for a Choice Scarf user, too, underspeeding the majority of Choice Scarf foes such as Jirachi, Krookodile, Galarian Zapdos, and Gengar.