I'm not Jig, but I'd say the battles and the capabilities of the Pokemon would be more like game or anime battles than what you're describing. Fire Pokemon will still be able to breathe/produce fire, Fighting types will still be super-strong, all that stuff is relatively unchanged.

EDIT: That's why something like an Onix or a Steelix, as we discussed on the last page, would be exceedingly dangerous. A twenty-foot snake made of rocks or metal... Scary, to say the least. Very powerful Pokemon like those will be rare, so rare as to be unobtainable, I suppose.