- Rock/Fighting
- Water/Fighting
- Bug/Steel
- Electric/Flying
These interest me the most. Pure Flying is pretty meh; I could take it or leave it, but it's quite nice to have a pure Flying type for the first time ever. =) Dark/Dragon is cute, I guess, but I'm not big on the whole Fighting-weak thing. Plus, it's weak to Bug moves, which is lol -- though U-Turn is the only one I can think of used regularly! Maybe besides Bug Buzz/Attack Order. Dark STAB is lovely though, as is Dragon, (though Dark isn't particularly the greatest complement to Dragon...?) and I expect the new pseudo-legendary to look awesome aesthetically.
Rock/Fighting sounds beastly. Stone Edge / Close Combat / Swords Dance... can you say pain? =o It could also go on a defensive route, I suppose... though offense seems more interesting to me. Just to be honest. Rock, Fire, Bug, and Dark resists are all well and good, but.. I don't really like the idea of something being weak to both Fighting- and Ground-type moves when defensive, to be honest. Not to mention a Water weakness. :/
Though the other three typings have already been done, but they're all excellent typings, and I'd be pleased to see how these turn out both competitively and design-wise. Can't wait to see Sugimori art of all of the legendaries. :3