I am still working on this, but remapping the whole game (so far) in HGSS is a huge task. I didn't expect the character files to be so gigantic - literally every map in the game has to be resized by 25% (larger) because otherwise, the characters look like giants. Plus, events need to be redone, too - bigger maps = different warp points = different move patterns.
That said, Hoenn is making some very nice trainer sprites for the project. Has anyone tried out Alpha 1.1 (FRLG graphics) since the last reported bugs? That's always helpful.