That's some very selective profiling you got going on there.

Registeel is beefy as fuck, so he doesn't give a damn about Snubbull's superior attack. Also, type advantage, bitches. Registeel can't feel no fairy type moves and normal type moves just slide off him like hot butter.
Also, Snubbull's weak sauce stats for comparison.

I love how the most powerful legends in Hoenn got Mega/Primals when they didn't need them, yet the Regis who actually do got totally stiffed.