Few Questions

Here is the sprite portion of the animation script for X-Zone (this is taken from the animation script document that madsiur linked)

Code:

; [ Animation Script $00D8: X-Zone (sprite) ]

D0/5A31: 00 A0                    speed 1, align to center of screen
D0/5A33: 80 72 01                 branch to $5A37 if attack hit
D0/5A36: FF                       end of script

D0/5A37: 80 8A                    command $80/$8A
D0/5A39: 89 25                    loop start (37 times)
D0/5A3B: 1F                       [---]
D0/5A3C: 8A                       loop end
D0/5A3D: 89 12                    loop start (18 times)
D0/5A3F: 1F                       [---]
D0/5A40: 8A                       loop end
D0/5A41: F1 80                    hide target monster sprite
D0/5A43: FF                       end of script

You'll want to remove the command at D0/5A41 (hide target monster sprite). You can do this by replacing the F1 at D0/5A41 with FF. Or you can replace the 80 at D0/5A42 with 00.

Try this and see if it works. You might also need to remove the command 80/8A at D0/5A37. That sets the monster's sprite priority to zero.