If Dark Prince can do it so can I. The only match I was reffing just ended, so I need something to fill my spots with. Combatents set their rules, but the arena will be thus:

Goldenrod City

The biggest City in the Johto region and each pokemon sent out in the battle will be double it's original size. The layout of Goldenrod City is simple, in the center is a large square courtyard where people often walk through or sit to eat and socialise. Around it is a small hedge. There are four main roads leading away from the square that move into the city itself. There are a variety of sized buildings, including the Shopping Center, Pokemon Center and Radio Station. In the distance the Bug Park can be seen as well as Illex Forest in the opposute direction.

The added downside (if you can see it that way) is that all attacks and moves now have a stronger physical effect on the city itself. There is no fine for damaging buildings are maiming innocent bystanders.