Did you change the right address? It looks like 240000 2417B7. I have no idea where Crono's palette is specifically in that one, but I think the process would be
Finding out how many colors Crono has in his palette
Having a Serge sprite that should probably use just as many colors
Changing Crono's palette to the Serge sprite's colors (you can use Irfanview to find out the specific colors, yes, as in that tutorial)
Importing the Serge sprite bitmap in Tile Molester
This is probably the extent to which I can help.