I believe that the cheat function doesn't work. I remember searching forever to find a way to get them to work but no luck. Just play the game like it is or use VBA for cheats if you need them that badly.
PAR_V3 (M)
205D5356 3DCE2E76
ABEE9D7E 5832AAE6
PAR_V3 HP In Battle
A178F169 41239FBF
A05A144C 078B0074
PAR_V3 HP Out Battle
8C57D694 CB339B75
D0E34D66 5796A7D3
Step 1 - Get .CHT cheat files.
Step 2 - Put them in the folder I noted (replacing E with whatever drive your memory stick is
If the filename (minus extension) matches whatever your ROM is (minus the extension) it'll load, otherwise you'll have to tell it to browse.