Well,I was looking for Pokemon SADX hacks (i got bored) and decided i would make one!
video: http://www.youtube.com/watch?v=mcHouJQr ... ure=relmfu
Pics:

This isn't that great. It's just a yellow tails with black ears and red cheeks. You should do more editing to make a mod with the goal you had.

For example, take Fiam's kirby Sonic. It's almost impossible to tell that he was put over Sonic. And it looks good to boot.

It would be much better if i could model edit Tails,but i tried and it said i did'nt have enough data or whatever in SADXMDL so i made my .exe bigger,It didnt work on my normal game. So i tried on pablodrago's 'sadx sonic'.exe and the model did work, but it had no PVM on the head. I cant hex using Hex Workshop/Edit so...It's kinda crappy.

It's not that you CAN'T use Hex Workshop, you just don't know how. Try reading tutorials on how. If you already have, then I'm sorry, but that's all I've got for ya.