Trying a simple hack and already having issues!

This is a simple change with a hex editor. Find this data in your hex editor:

Code:

(Data - commands that can be replaced with other commands thanks to Relics)

C2/5452: 05   (Steal)
C2/5453: 0F   (Slot)
C2/5454: 0D   (Sketch)
C2/5455: 02   (Magic)
C2/5456: 00   (Fight)


(Data - commands that can replace above commands due to Relics)

C2/5457: 06   (Capture)
C2/5458: 18   (GP Rain)
C2/5459: 0E   (Control)
C2/545A: 17   (X-Magic)
C2/545B: 16   (Jump)

and also this data:

Code:

C3/6198 data: commands to change (from)

C3/6198:    05          (Steal)
C3/6199:    0F          (Slot)
C3/619A:    0D          (Sketch)
C3/619B:    02          (Magic)
C3/619C:    00          (Fight)

C3/619D data: commands to change (to)

C3/619D:    06          (Capture)
C3/619E:    18          (GP Rain)    
C3/619F:    0E          (Control)
C3/61A0:    17          (X-Magic)
C3/61A1:    16          (Jump)

Change the locations that say "Slot" from 0F to the code for Runic, 0B. Change the locations that say "GP Rain" from 18 to the code for Shock, 1B. Then make the Coin Toss equippable by Celes and it should work to change her ability.