I just beat the first mission, but all that soft-resetting for a good-IVed starter was pointless, since the Sceptile I ended up using got replaced by another one and the other two Hoenn starters.
The Glalie I caught didn't have good IVs, but that doesn't concern me, since I'll be breeding up another Snorunt to use with the Glalitite. Are you going to use the demo Glalie in-game?