1.) I wouldn't be surprised if Krystal was the Champion. I got Crescent vibes from her when she talked to Kanon and I think she assigned some sort of "role" to him like Crescent did to Nim / Lorna.
2.) Yes, I exposed Flora. However, I feel that both her and her brother are guilty for different crimes so bad events will happen whether you expose her or not.
3.) Since I exposed Flora, I battled Florin (on Intense). My Nidoqueen ripped through 4/6 of his Pokemon. My Magnezone OHKOd his Cradily and my Gardevoir did the same to his Mega Sceptile. My Typhlosion couldn't do too much due to Uproot dealing ~70% of his HP and pretty much all of his Pokemon out-sped my Typhlosion. Overall, it was pretty easy for me but I can see Flora and him being nasty for those who don't have a fast or very bulky answer to extremely powerful Grass-Moves. Flora is definitely harder with her Mega Venusaur + Screens and Whishmoncott's Moonblasts.
4.) I think that Aelita is the red-haired girl in the forest. I think that the others are either deep in the forest we cannot access of inside of Grand Dream City. I sure hope that they haven't turned into stone! D:
5.) Yup! Did the manor sidequest (which was great btw) and am currently exploring for hidden goodies with Strength.
Anyways, I am really enjoying the exploration factor of this Version and the map redesigns, especially on Terajuma, are phenomenal! Kudos to Jan and the others that assisted in the creation of Pokemon Rejuvenation. It has been a blast watching this game progress!