GE3 Controls

Square: Light Attack (Melee Form)/Fire Bullet 1 (Gun Form)
Triangle: Heavy Attack (Melee Form)/Fire Bullet 2 (Gun Form)
O: Dash (Melee Form)/Roll (Gun Form)
X: Jump
R1: Switch between Melee or Gun Form
Hold L1: Lock On/Aiming Reticle (Some gun types can lock on after bringing up the reticle)
Tilt R3: Swap Lock On Targets

Hold Triangle: Charge Devour (Melee Only)
R1 + Triangle: Quick/Air Devour (Melee Only)
R1 + O: Guard (Melee Only)
R1 + Square: Special Melee Action (Melee Only)
R1 + X: Melee to Gun Action (Melee Only)
*The type of action can be changed in the Options menu
R1 + O: Special Gun Action (Gun Only)
R1 + Triangle: Fire Link Burst Shot (Gun Only)
R2 + X: Dive