Khronify

Have the Frozen Orb from the Ruby Island ranger quest, go to the surfing spot in Silver Rise Mountain, enter the cave and surf to the right of the Articuno statue, there should be another cave that has the Articuno encounter at the end. It's not confirmed but if you see a man blocking the entrance you might have to finish the e5 story first.

Go back to the Silver Rise Mountain from the teleporter, keep backtracking and eventually you'll find a cave that you can only get to by surfing.

I have 10 vendors and I got 10 credits after the final gym battle. It seems that each vendor is worth 1 credit. Keep in mind the twin vendors count as one.

Spoilers for ending of E5

That's probably my only gripe with this game, the battles are way easier later in the game because of the ev training and stuff. Well they do have to remake teams again if gen 8 is coming with E6 so hopefully it'll be harder next version.

I think it’s pretty obvious Ava has a crush on the MC, whether or not that would be taken further is up to Caz. We still have to fight her as a gym leader as well so there’s room for more interaction.

Spoiler talk about the ending

Beat Rosetta, talk to a guy next to all the character appearance changers, use that key on one of the warehouses in the south, then use that key on the door in the powerplant