Pokemon games keep frezzing on me Plz Help

I been trying to play HeartGold and Pokemon mystery dungeon : explores of time and they keep freezing on me.
I made it pretty far in the mystery of time but after i get done with the mission that chatot told me to get Perfect apples the game froze when team skull was walking away. The said something about BIOS.
Then I was playing HeartGold after I get my pokemon and walk around a bit then it frezzes.
So can someone help

New improved Patched ROM's to help fix freezing issue.PMHG (USA)http://forum.romulation.net/index.php?topic=58950.0PMSS (USA)http://forum.romulation.net/index.php?topic=58951.0Anyway what are you using to play the games on ?, BIOS is used for NDS emualtors for PC.

Pretty sure he was using an emulator, cause flashcarts won't ask for BIOS.By the way, the issue could also be caused by over using cheat codes.

Replying to #3

Yes this to, using to many codes at same time can also cause issues with freezing in game play.

I was using alot of cheats for mystery but not heartgold but...Ill try not using them then if that doesnt work i use the downloads thanks you 2