I just beat the Elite Four, and had no problems with the game up until the post-game. When I attempted to go the the Battle Area, whenever I arrive, the game hangs.
If it helps I am using DeSmuMe with WiFi v0.97.
I really didn't like playing online against other people always felt like I was being matched against children... Sorry it's your 7th birthday but I guess I'm supposed to mow you down anyway...
I have reflexes a cat would be jealous of and a near psychic ability to read people, makes online play feel incredibly unfair. Ironically I have been booted from online servers for being a bot.... Or aim assist lol