That address is stored in ROM (the data the address points to is stored in RAM) so there is no way for Stadium to change the fact that the genes reside there.
Have you calmed down, put in on the GB, put in the max gene codes you have there (correct for yellow), turn OFF the switch, start the game, load the file, get the monster to be modified on top of the list, turn the switch ON then turn the switch OFF, then deposit the monster in the PC, bring it back, and check on it?
Also, remember that this won't max your stats, just your potential. It's different codes to max stat EXP.
Hope this helps,
"MOVE IT, OLD MEN!! YOUR TIMES ARE OVER!"
-Jody Summer, back of F-Zero X box