amiibo features in Super Mario Bros. for Wii U:

Touch

• Touch your amiibo figure to the Wii U GamePad controller to bring it to life in the game 

Train

• Train your amiibo to supercharge its stats and expand its abilities
• Customize special moves for your amiibo

Triumph

• Take your amiibo to a friend's house and pit your amiibo against your friends' amiibo figures
• Fight against your own amiibo to teach it new tactics
• Team up with your amiibo and fight together
• Send your amiibo into battle against your friend