I started playing Emerald few weeks back. I wanted to use cheats here. I had put the master code and the master ball code which works absolutely fine. But whenever I use pokemon code nothing happens. Keep in mind, I play On my Android phone in the GBA emulator (not the John lite version). Once I put the Pokémon cheat and then use the PC in Pokémon Center the game just freezes.
I don't know what the problem is but when I searched about it many people claim that they had it worked on their cell phones.
The code I'm using is for Bulbasaur: 83007CF6 0001, which I obtained off the supercheats.com site