I was gonna ask the same thing :(Forgive me if this has already been answered in detail, but I couldn't help but wonder if there's more to the ban on metagames that use nicknames from becoming Other Metagame of the Month than simply "it's not obvious how to make a team for it." Awhile back I read a discussion on another thread (I think it was the Type Control thread) about the OMotM blacklist for nickname and Import/Export metas and that (roughly) was given as the rationale, and while I agree on the front of Import/Export metas since that feature isn't generally used for directly editing team data and an explanation would be pretty lengthy I don't see why the blurb for the new metas which appears on PS's main page can't be used to explain what you're supposed to use the nicknames for, so if there's any additional reasoning for why it wouldn't work I'd appreciate hearing it. (Contrary to the argument proposed in that thread, I don't believe nicknames to be fundamentally different than, say, the arbitrarily-assigned items which grant abilities in Enchanted Items)
Since metas like Cross Evolution are gaining popularity, it'd be a nice thing if nickname based metas were allowed for Gen 7.... I don't see why they shouldn't be allowed