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I'd personally be fine with just being able to interact with major characters more. HGSS was okay about it, mostly for the phone quest, but expanding it more to B2W2's idol side quest would be really neat. The best HGSS offers is trading with Brock, I'm not that impressed. Hell, Gen 7 occasionally tried, although it did a really shitty job since the Trial Captains don't do much to begin with. Still better than the basically nothing XY offers, or the cut minor league gyms in SS.