I'll ref if you want.
The arena:
Santa Klaus's workshop.
In the inside you can pick up toys to use/throw/play with.
throwhing will deal 5% damage each and using will depend on the toy (Like a sword deals more damage then a plastic ball). Playing will recover some healt because of the joy your pokemon relacses his mussels so they can heal.
Every three rounds santa comes to refill his bag. If your in the way off his rendeer better look out becauses those horns don't look weak to me. You can also throw your opponnent outside in the north pole. There santa's elves/jynks will throw you back with psychic or just punch you back. This will deal 5-10% damage
I hope this is christmassy enough for ya.