The following are known Action Replay Codes for Pokemon Dash on Nintendo DS (NDS).

Game ID: APDE-E15147EE

Max Series Points (Never Lose Cup)
2218c9d4 00000063

Unlock All GPs
220d54f8 000000ff

Unlock All Cups
220d5c0d 000000ff

Unlock Time Attack
220d5c0c 00000032

Low Time: All Tracks
a20d5590 00000001
d5000000 00010001
c0000000 00000024
d6000000 020d54fc
d2000000 00000000
120d5590 00000001

All Gold Trophies
220d55dd 00000000
120d55de 00000000
020d55e0 00000000
020d55e4 00000000
020d55e8 00000000