Remember to have all your characters take a swing at it, then have Yuna come out to play. After the Ochu's turn, summon Valefor and have him use his Sonic Wings attack...this delays the Ochu's turn. Keep hitting him with Sonic Wings untill it has 300 or so HP left...dismiss Valefor and Bring out Lulu...Cast Fira or Firaga...BOOM! You kill the Ochu with minimal effort and get an OVERKILL in the process.
A - E N - R
B - P O - Y
C - S P - B
D - T Q - W
E - I R - H
F - W S - M
G - K T - D
H - N U - O
I - U V - F
J - V W - X
K - G X - Q
L - C Y - A
M - L Z - G