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I'm a little late to the party, but anywho. I'll likely be going with Cubone, and Cyndaquil this time around. Bone because of the multi hit attacks, and Quil because Smokescreen is a godsend for any situation due to how broken Whiffer is. I'm a little disappointed to hear that the Gummi system has been altered around, but I might have to wait until release for more info.
In terms of wants..
>New Pokemon beyond Gen 6 in the post game
>New post game dungeons
>Alolan/Galarian forms of Pokemon getting in, since said forms are mostly of Pokemon from Gens 1-3, and the roster is essentially Gen 1-3 Pokemon. Maybe even the Galarian forms of the Legendary Birds?
>Being able to swap to Hidden Abilities
That's really it, though.