I believe that you can use any Pokemon competitively, that would be awesome if you developed a way to integrate your castform into an amazing team. I updated the Club information in the main post concerning the Elite Four and Champion rules. I would love to see a castform user up there .
By the way, do you know an easy way to find the dimensions of posts? I am trying to infuse CSS things into the Club but I am having a hard time. I really want a background, it would look sweet for our club!