You can play through the whole game. You will have frame drops down to the 30s but its playable.
Drwhojan just released this build and its pretty solid so far
http://www75.zippyshare.com/v/yR0u67EH/file.htmlIf you think i'm trying to hack you, heres the official link (last few pages)
https://gbatemp.net/threads/citra-unofficial-chinese-builds-discussion.431974/page-123When you challenge the champion you have to use only 3 pokemon which shouldn't be a problem or you will crash. Also you're going to want to search through that gbatemp thread for Line removal codes and speed modifiers. Make sure to disable vsync completely and use that build built in frame limiter