Hm...I used Hinata, Suigetsu, Sai and Azure with the Water +% talent and clone...

Took maybe 2 tries...first I looked at how it worked out through damage.
2nd try I Diamond shaped the formation

X Suigetsu X
Sai X Hinata
X Azure X

saved their mystery skills for Gamabunta...and destroyed him before he threw his water bombs...though everyone did live through the 2 sword slashes(near death...but still alive)

Worked like a charm for me..