There are no traditional cheat codes (button combos/passwords) for Marvel: Ultimate Alliance on Wii. The game uses an unlockable progression system instead.
Wii version uses Wii Remote + Nunchuk. Motion controls for "Heroic Actions" (shake to interact) and some attacks. No Classic Controller cheat entry screen exists.
Focus on learning hero synergies (e.g., Storm + Thor = Lightning Storm), farming tech bits for equipment, and completing Simulator Discs for XP/credits.