The following are known CTRPF AR Cheat Codes for Super Mario Bros. 3 on Nintendo 3DS (3DS).

000400000006E900.txt

[99 Coins]
288B00AE 00000063

[Invincible]
288AD83F 000000FF

[Have All Items]
088B008C 01020304
088B0090 05060708
088B0094 090A0B0C
288B0098 0000000D

[99 Lives]
288ADA22 00000063

[Reset Timer to 990 push R+RIGHT]
DD000000 00000110
288AD8DA 00000009
288AD8DB 00000009
D2000000 00000000

[R+LEFT for Small Mario]
DD000000 00000120
288AD3D9 00000000
D2000000 00000000

[R+DOWN for Big Mario]
DD000000 00000180
288AD3D9 00000001
D2000000 00000000

[R+UP for Raccoon Mario]
DD000000 00000140
288AD3D9 00000003
D2000000 00000000

[L+RIGHT for Hammer Mario]
DD000000 00000210
288AD3D9 00000006
D2000000 00000000

[L+LEFT for Tanooki Mario]
DD000000 00000220
288AD3D9 00000005
D2000000 00000000

[L+DOWN for Frog Mario]
DD000000 00000280
288AD3D9 00000004
D2000000 00000000

[L+UP for Fire Mario]
DD000000 00000240
288AD3D9 00000002
D2000000 00000000