Never thought that would be a option. Just tried it but the game still crashes.
first test these 2 cheats together, if it works then you did something wrong
[21# Always Encounter (M) (Hold R)]
04000000 00766F90 B9402A68
04000000 00766FBC B9402A61
04000000 00766FC8 79405A61
04000000 0076708C B9402A60
04000000 00767094 79405A61
04000000 007670F0 B9402A60
04000000 007670F4 79405A61
80000080
04000000 00766F90 18FFFE68
04000000 00766FBC 18FFFD01
04000000 00766FC8 18FFFC81
04000000 0076708C 18FFF680
04000000 00767094 18FFF621
04000000 007670F0 18FFF360
04000000 007670F4 18FFF321
20000000
[Always Encounter (Unobtainable): #001 Bulbassaur]
08000000 00766F58 00000001 00000000