Well met Spped.
Welcome to Reborn!
I'll let you know that here in Reborn, the Sun is unnecessary. We have Magcargos.
As for your questions, well:
1- Check the obtainable list . Any starter that isn't marked as a "Limited Event", you can get it in another way. That list is for Episode 15 btw (The next episode), so it's just for you to plan ahead.
2 - Deleting the folder is a good idea since going back to past episodes can result in bad situations. Your save won't be affected if you delete the folder, unless you're on Mac.
Well, I hope you enjoy your PeRmAnEnT stay at the place place~
I'll see you around o/