ok, i found some evolution modifier codes.
01??EBCE on red/blue (01??EACE on yellow)
01??B8D0 on red/blue (01??B7D0 on yellow)
so to make your graveler evolve:
1. modify it into a geodude.
2. make it level 99 (if it is already level 100)
3. while using these codes,
0131EBCE on red/blue (0131EACE on yellow)
0131B8D0 on red/blue (0131B7D0 on yellow)
hit it with a rare candy.
and it will evolve into golem.
this isn't too useful though, since if you just change the graveler into a golem directly and box it, you get the same effect.