Just because it's been a few days, I'm going to go ahead and say yes, almost definitely. In general you're allowed to sign up for more as many as you like, within reason - unless specified otherwise...
Anyway, @FinalMaster, any luck with getting the two pre-time-travel sign-uppers?
P.S. Maybe we should all start using the OOC thread more. To be honest this post should probably be on there... ah, heck.
Just an added thought, can Metang be shiny? It's just I've recently realised that the Beldum line looks AWESOME in shiny form.