Personally, if you're looking at Lv. X, I think one should first take at whether or not Nintendo is going to release 5th gen. If you ask me, that'd be getting a little redundant. There's already nearly 500 Pokemon out there, and most of 3rd/4th gen were a little redundant. An evolution of Magneton? Magmar? Maybe I'm one of the few, but I'd prefer they release enough for 600 and then say they're done, because in my eyes it's getting ridiculous. Maybe I'm just one of those hard-core players that loved anything WotC too, but eh.
...however, I do wish to see a whole set of Destiny Pokemon again. Oh, gods yes. I still LOVE my Light Dragonair/Light Flareon/Light Vaporeon/Shining Mew cards from that set. It's cards that make you pick what side you're on, good or evil...it makes the game that much more personal.