The application known as StreetPass Mii Plaza is one that can be found pre-installed on all Nintendo 3DS consoles. Players are able to meet and interact with the Miis of other players in the game through the use of StreetPass and the Nintendo Network.
Cheat Codes here:
[Hat Changer]
D3000000 30000000
2250C7EE 00000001
[Hat Tikets 999]
D3000000 30000000
124C6876 000003E7
[Nice 9999]
D3000000 30000000
1250D6FE 0000270F
[Number of Mii met]
D3000000 30000000
0250C7E8 0098967F