The following commands must be used for the corresponding shops:

Shop 1
Left Analog-stick clockwise, A, Left Analog-stick counter-clockwise.

Shop 2
Left Analog-stick clockwise, X, A, Left Analog-stick counter-clockwise.

Shop 3
Left Analog-stick clockwise, A, Left Analog-stick clockwise, X, Left Analog-stick counter-clockwise.

Shop 4
Left Analog-stick counter-clockwise, A, Left Analog-stick clockwise, X, B, Left Analog-stick clockwise.

Shop 5
B, Y, Left Analog-stick clockwise, A, Left Analog-stick counter-clockwise, X, B, Left Analog-stick counter-clockwise.