Here's a little tidbit about Akuma Selvin might like, In MvC2 Akuma had FIVE supers.

Mesatsu Gou Hadou
Mesatsu Gou Shoryu
Mesatsu Gou Senpu Kyaku
Tenma Gou Zankuu
SHUN GOKU SATSU!!!!!!

P.S.
Does anyone know who performs the "Tenma Gou Shinkuu Ha"?

not me.

Nay.

Yes I knew that and he has the same 5 supers in Street Fighter: Third Strike. If you really want to know how to do the move. Here: (this is how you do it in SF3: Third Strike) down, down, down, any 2 punches. I hope you are talking about the attack that looks like a magnetic shockwave.