These are the controls in Both Ben 10: Modern Digi-Brawl games.
PlayStation 3/Xbox 360:
X/A: Fist/Foot(Punch/Kick)
Circle/B: Energy Blast(For certain characters)
Square/X: Transform/Digivolve(select form for Ben Tennyson and other capable characters)
Triangle/Y: Special Move Combo
R1/RB: Lock Target
R2/RT: Special Move Combo
L1/LB: Free Camera
L2/LT: Special Move Combo
Left Joy Stick: Move
Right Joy Stick: Rotate Camera
L3/LS: Special Move Combo
R3/RS: Lock Camera
Left/Right D-Pad: Tag Other Characters in Playlist
Up/Down D-Pad: Unused