For team types viable in the metagame, I think HO is actually one of the least viable. With bulky offense so popular, it can tank hits from HO and KO their frail sweepers. And not to mention shit like Gliscor is used by everyone and their cousin thanks to the metagame being so standardized.
Dude the only thing standard cores are good against is defending against one threat each (your rachi takes on Latios, Gliscor for Excadrill). Roto / Glis / Rachi is a joke against dual screens offense since everything is only walled by 1 of the three depending if its physical or special and they get overwhelmed so easily. Also frail sweepers aren't so frail when everything is doing half to them (not to mention calling something like Reuniclus frail)







