What program Is the best and with easy use
for vertex editing? :P
Well that depends.
Anim8tor is the best free alternative. There's a guide up here somewhere that discusses it.
The BEST program to use would be 3DS max, and that can only be used if you have $1000 dollars to pay for it.
*Cough* or pirate it *Cough*
Can I edit Cloud Blade Vertex with Animat8r?
Most likely. :)