Yeah, I've been thinking that, that it just happens that the most powerful and likely to be suspect candidates (if not outright ban) all struggle against it.So I think pretty much everyone has come to appreciate his shockingly high viability at least right now but what are some meta changes that might bring this guy down? I mean right now he's insane cause we have people thinking they can just spam UB's and Genesect and win but he counters them all quite well. Once the "lol I'm just gonna use a bunch of legendaries!" phase dies down and people start playing real teams what would Marowak have to watch out for? Bulky waters are obvious but I feel he could still be useful even if rain becomes popular since rain likes tapu koko and volt switch as well and he counters that...
If this guy actually becomes and stays OU then honestly I'll be surprised, I always liked him and wanted him to be good but I never thought he'd really be that good. What wonders a change of typing can do, his stats are identical to the PU Marowak.
I don't think it will ever be without an OU niche, though.