Rules- Just like Razor Leafs idea, three pokemon out at once, only TWO attacks per turn, not three. To be fair, once we have a ref and an opponent, we send our three pokemon to the ref. Here are the basic rules.

We each send 3 pokemon to the ref
Once that is settled, you select attacks first.
I attack second

Arena is fairly simple. We'll go with the North pole. Pretty much endless snow. A ice lake is to the side. The ice can be melted. After 5 turns, Santa Claus will fly by. What he does is completly up to the ref.

An option for my challanger to decide, if you so wish, we can use pokemon in their basic form.