I think it would be better to give Gardevoir mega instead of Tyranitar. Tyranitar does well enough without one (i usually run Assault Vest on it, though that would mean you need to scrap Dragon Dance for something else) but Gardevoir might need the extra power it brings.
There's a daily trainer (or several trainers) at the Grand Hall which you can challenge, but that's it. Adding some more re-battleable trainers would indeed be nice. I don't think there will be a battle tower anytime soon.
I have never gone on a plane before, but that's basically because of that reason...
If the Reborn League were to be restored, but all old Leaders were unable to continue, would you sign up for a Leader position, and if so, which one?
I'd rather live half my life with internet, considering the last half of your life not very much happens anyway and internet is so important now that i'm still going to school/college. Libraries are fun, but the internet has more.
If you could persuade Ame to add something in the Reborn game that you want, what would you ask for?