Here you go.
http://dl.dropbox.com/u/62979271/M_a_r_t_h_over_Peach.rarI patched murrth's .rel a bunch of times to see who he can go over. I tried efurryone except the alloys, PT and transformurrs except Bowser. He, oddly enough, did work on Bowser, but his Fitmotion had to go in the common4, I think.
That DL only has the codes and the .rel for putting murrth on Peach. Also, when on Peach his Side B's 4th hit might be WAY too fast. (It was with Roy, that's for certain x__X )
I'll try to answer any questions you have if something problematic occurs.
Have fun~ :3
EDIT: There we go. That should work. This April Fool's day gimmick is wearing a tad thin.