Get Powers early
     At  the stage select screen, Hold Z and press + to start inputing
the codes. If you want to clear the codes Hold Z and press -.

     You will hear a confirmation when you do the combination to enter
the codes, when you enter said codes, and when you clear them.

Swing your Wiimote Down, Up, Left, and Right: Unlock Tail power
     Swing  your  Nunchuck Right-> Swing your remote left-> Swing your
nunchuck  right while swinging your remote left->Swing both remote and
nunchuck down: Unlocked Double Fist power

Unlockable items
Long Sword: Beat the game once