how does pokemon emerald rogue work between runs?

the hub is the part that carries over. your team doesn't, every run starts fresh with a new starter, but the upgrades and unlocks you build up in the hub stay, so later runs open up more options than your first one did. if I remember right, mons you caught on earlier runs also end up somewhere you can pick them from at the start of a later run, which is what stops the early game feeling the same every time. worth going through the settings before you start too, a lot of the difficulty and item stuff is adjustable.