This was surprisingly easy to add, albeit a bit awkward. I learned how to add trainer battles without headers this way, so I may go back to CeladonU and restructure with this in mind.
This commit adds a fully functioning Professor Oak fight, using the Rival party choice script as a launchpad. You can desynchronise the choices easily, just a few number changes. I used the S. S. Anne 2F and Route 22 scripts to hodgepodge it together.
Because of how I did this, Oak is fully re-fightable, taking inspiration from XY Serena's daily re-fights.
I tried to add a Yes/No prompt, but it would still pull you into the fight, presumably because it's calling a beforebattle script before the code. It's a bit of a hassle and my CeladonU code sucked, so I decided to leave it out for now.
It's intended to be unlocked once you enter the Hall of Fame, thus that change there. That hasn't been tested properly so uhhhh *shrug*
I am 90% sure something will bug out, can't test the map right now for obvious reasons. Tested everything else, though.
Mostly copied data from Cinnabar Volcano while commenting out Vermillion Dock Mew info to move it.
Wild data has been added along with a fishing group, just dummied out slots.
Old Sea Chart is a clone of the Citrine Pass which is all it needs to be. It is obtainable near the truck.
Overall completes Celadon University sans a problem with sprites being a bit corrupted until you leave. New Magikarp Salesman-esque events in other pokecenters which is kinda neat