As Hex said, TCG questions are welcome on Pokebase. This is basically what tags are for: http://pokemondb.net/pokebase/tag/tcg should show you all the TCG questions, assuming they got tagged correctly. Similarly for anime.
RMT is a special case really, to avoid clogging up the regular question list with too many RMT questions. If TCG got really popular here then maybe I would consider a separate section. I'd love to have more TCG (and anime) questions, but I don't really know much about either, I think the majority of our members are video game specialists.