The thing that makes PSO: Pocket different
MAG Lab is a standalone mode accessible from the title screen that lets you import MAG data from Dreamcast PSO Version 2 saves, raise that MAG inside PSO: Pocket, and then export the updated MAG back to the save.
That means your handheld runs aren’t just self-contained side content. The meseta you earn in Pocket feeds into a proper Dreamcast-connected loop: play, earn, buy feed items, raise your MAG, sync it home.