>>39956311I don't know a lot about romhacks but I've had a lot of fun with Crystal Clear. It's Crystal but completely open worlded and with a few things added to help it be an open world. (Ferries, some new areas, Team Rocket being defeated, Magnet Train is open, all 251 pokemon available, so on so forth. You can even choose which region you'd like to start in.)
It's a great time if you're a gen 2 fan. It's even got a few things from HG/SS like following mons.