Soooo I have never played a handheld Pokémon game in my many years of life... (yeah, I know) I’m starting with Pokémon Yellow. I kinda wanted to do a few things differently and start over, but I still want to have the Pokémon I’ve acquired. So is that even possible?
Yes. It is possible. In any Pokemon game, it is possible to trade and get Pokemon of different save files. However, in older games like Pokemon Yellow, trade animations are slow, so only trade Pokemon that are worth trading.