Okay so here's kinda what I'm thinking: Personality test is always fun. Don't get the starter you want? Either soft reset or tough it out. I never used a Totadile before I played PMD and I really enjoyed it. Anyway, the starter options are all the potential non-legendary Pokemon with evolutionary lines that have a a mega (scratch that. Remove Abra because that's just a pain. Especially since you generally can't evolve until the postgame). Anyway, so you could have your traditional starters plus a few extra ones like Electrike or Meditite or Ralts. Fun stuff. Also, you get to choose your partner as usual. Only one mega evolution is allowed on any given floor of a dungeon to keep it from being too OP. You get your own Mega stone through the rescue of a big important person or something. It doesn't make a huge difference, but it would probably happen in the postgame like Rescuing Scizor. Main story has something to do with Yveltal killing the player whiel the player tried to be nice to people and so Xernas recognizes the good nature of the player and gives them a 1up and a new chance. Big old arc about Finding Diance or something similar. Fun fun andlal that. Then Xerneas shows up and the player is all like "well golly gee this feels familiar" for obvious reasons. Xerneas passes through, gets kidnapped by Hoopa being a jerk and because Hoopa wants someone who is technically a human (*cough cough player*) to unbind it from the Prison Bottle because Pokemon can't unbind it, that'd be silly. Anyway, so player rescues Big X and X is all like "wow you're stronger than the average mon I shall call on you again." and leaves. Yveltal gets reintroduced as the main antagonist and ends up doing away with Xerneas in some way so the player needs to go find Zygarde to restore balance to the world and so them theu find Zygarde, get him to help the player and partner, face down Yveltal and then that's the main plot! Cue evolution+megas+all Gen 5 and previous legends+ Volcanion side quest like Ho-oh's in the original PMD games.
That's my basic wishes and ideas for the game.
ALSO THIS IS POST NUMBER 300 HECK YEAH.