That is the Spin-off Games forum. So we already have a forum for that, and Sydian (the moderator of Spinoff games) alone has handled the activity for that one forum (which encompasses every spin-off game) and every other forum (about two) she mods for quite a while now, which tells us there's not that much interest for Pokémon Conquest as a whole. If there is a deluge of activity for Pokémon Conquest in that forum (that isn't spam, mind you), the staff will consider making one. But even then, they'll probably just put another mod in that forum instead of making a new one.