Some common questions I'm getting asked:
Is it too late to join?
You can join anytime during the tournament.
Can I battle the same person again?
Yes, it doesn't matter.
Do I have to use my bonus Pokemon in-battle?
Not technically, it just has to be in the team you used. It doesn't have to actually switch in.
In the PM for bonus Pokemon, can we use either the regular or Mega Evolutions for the Pokemon we were given?
Yes. For example, when I say that Kangaskhan is one of your bonus Pokemon, you can use its MEvo, or you can just use regular ol' Kangaskhan. No one is restricted to one or the other.