>>32922763The issue is that I doubt they'd release a pair of Rock-type cover legends like they did with the Kyurems, likely giving themselves only one chance to get it right instead of two. And Rock is a fairly delicate type to get right, like Ice, so something like a Rock/Psychic Solgaleo clone with a Rock-type Sunsteel Strike might not even prove to be too much for OU.
Hell, with the Sand Special Defense bonus, Tyranitar has at an effective BST of at least 659, depending on investment, and it was fine even in the Diamond/Pearl era.
Fun fact: Tyranitar was the first Pokemon to actually get a suspect test way back in Gen IV,
before even Garchomp>>32922793Garbage. Might struggle to break into NU without a great signature move.