I've defeated Shanks and then bought everything in Gol D Roger's shop but I don't see any fights of 200 or beyond, I wanted to try and get Gol D Roger support without passwords. I think I read somewhere of a translation to "Complete all stages" which I'm fairly sure I've done - unless it means 100% complete the bonus missions as well. I suck on the bubble mission so haven't done that one… but I will try again if that is what needs to be done.
IIRC you need to clear every stage, including the bonus requirements (aka get a gold flag, not just a blue one for every single stage) before you unlock the last few level 200+ battles.
I'm still training up for the final level 250 battle, and trying to unlock Big Emperor. But this game could have been so much better if they wait for more content, add proper pre-time skip Franky and Robin, and include more moves variety. I was hoping that Lucci had the the soru + multiple bachi, and hibachi moves that he used against Luffy, but to be fair Lucci has tons of moves.
And the main storyline mode is too short….I think I took 1/5 of the time needed for GB1 to unlock nearly everything in GB2. Feels weird when there's more characters and supposed more stages. They did away with the individual character training and multiple bonus criteria, but should have EVEN more stages, or just 2 bonus criterias per stage.
I also noticed that they made changes to Boa Hancock's diagonal down + B move on the ground. In GB1 it was a pistol kiss going downwards (barely any use), but in GB2 it's a pistol kiss going horizontally, so it becomes a range attack. Not sure if there's any other minor changes to old characters.
Hope that there'll be a GB3 in the future.