Welcome to The Cave of Dragonflies forums, where the smallest bugs live alongside the strongest dragons.
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Of course I'm not forcing you to do anything if you don't want to, but seriously, what have you got to lose? Five seconds of your life?
Bring back the Underground and make it so you can use it either with or without Wi-Fi.
A huge underground tunnel under a whole region doesn't seem reasonable, if they add it back in, then incorporate in the story. EG: The evil team in the game plans on collapsing the tunnels, to destroy the region or something.
Incorporate the underground into the aboveground, including secret bases. Have it so that you may mine in caves, which there are bound to be, and have bases located similarly to R/S/E. Traps were fun, as well as CTF, so those could stay. Possibly have an online high scores table based on CTF.
I didn't particularly like the underground, it just reminded me of my lack of friends with the game and my inability to get spiritomb. Used it to get Heart Scales, though.
MOVE TUTORS. That is all.
Walking your pokemon looks quite fun.