It was revealed today that Zygarde is going to have a few new forms. And while all the details of it are currently unknown, some things should be noted.
1. Zygarde Core
2. Zygarde Cell
3. Zygarde 10% Forme
4. Zygarde 50% Forme (which is the "Normal" Zygarde we've already seen in Pokémon X/Y)
5. Zygarde Perfect Forme
While the names are confirmed for Japan, and not yet for the US, should tags be implemented for them anyway, and then changed when the English names are given?
I distinctly remember the "Mewthree" placeholder tag, back when Mega Mewtwo Y wasn't officially named.
Updated by Clawdragons