Well, made it down to Cinnabar island, meticulously took on all the trainers leading up to the Seafoam Islands and got my badge from Blaine. Everyone's hovering at around level 52-53, and today I'm going to continue back along the water route to take care of the rest of the trainers, then take on Gary.
After that, I'm not sure. I really did this replay as a fun way to recover/retrain lost Pokemon, so there's not a lot I absolutely have to do.
X team: Chespin, Goomy, Amaura, Skiddo, Spritzee, Espurr!