Hey Chainsaw, what you got planned for Hoenn? Personally think you should do something with contest mode if you're going to create mini-games for all the regions. As for Sinnoh and Unova, thinking the undergrown tunnels for the first one, and the battle subway for the second.
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True, not a lot of legendaries to compete in it at this stage in the journey. Not to mention that it'll be hard to turn it into a series of mini-games. But if there must be pokemon to fuck there, you could always have some fighting type pokemon competing there. Just need to complete their challenge, before you could fuck them.