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I would like to see past generation Legendaries be catchable, but they'll probably hold it off until the third version/sequel/remake like they did in the past.
As for what Pokemon I'd like to see, definitely include Latios and Latias again. Maybe the Musketeer Trio as well?
~ Hikari
Sites like Global Pokedex Plus managed to pull this off, by having eggs designed after the Pokemon it contains. I would like to see personalized eggs similar to what they have there seen in-game but given we're going to have around 700+ Pokemon, it's going to be a bit tricky.
At least it would...
I would like to see a Poison-type Legendary sometime, cos we never had one so far. I do agree with Rainbow that Yveltal will probably be Dark/Flying, and Poison Pokemon usually get shallow movepools.
And if we were to have a Poison Legendary, at least give it a workable moveset.
~ Hikari