who will win?!
He can beat all the aliens of nemetrix (for exept his own predator).
Ult Echo Echo, easily.
One, just ONE sonic doom attack would be enough to kill Mucilator, just like it almost killed Kevin in his ultimate-monsterish form.
So.. yes, Ult Echo Echo would totaly win.
All nemetrix aliens would lose against ultimate echo echo, or even echo echo for that matter. Due to the fact that they all have enhanced hearing.