I've been playing through sacred gold for a while now and I've got to olivine city. Now whenever my Pokemon try to level up in battle the game freezes, I've been having the same problem with tm's. Rare candies seem to work fine. I've been using the 100% catch rate and 200x exp multiplier ar codes if that has something to do with it. It means I can't get any further in the game and I really don't want to start again. If anyone can help with the problem then it would be greatly appreciated.
Try disabling the 200x exp multiplier arcode and try playing and see if the game still freezes, if it does try disabling all codes and try again and if the game still freezes i have no idea sorry xD Everytime my game freezes because of some code is always because of the ''All items'' codes