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Ok, I get WHAT I have to type but WHERE do I type that. Do I just join a random Lobby and type it or do I search for a player and type it into the popup chat window or somewhere else entierly?

Where do I need to type a match command and can I add multiple OM clauses to the same game IE could I run Category swap and Stabmons in the same game?

How come certain items/attacks/forms are banned? I'm curious as to why stuff like Berserk Gene or Zacian-C without rusted sword seem to be banned? Is there some problem with availability or is Showdown just wrongfully telling me they're illegal?