The following are known Action Replay Codes for The Legend of Zelda: Link’s Awakening DX on Nintendo Game Boy / Color (GB / GBC). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

Infinite Arrows
013045db

Infinite Bombs
01304ddb

Infinite Health
01185adb

Infinite Magic Powder
01204cdb

Infinite Rupees
01095ddb
01995edb

Walk Through Walls
01100ac1
01007ec1

View The Ending
010195db

Fly
010046C1

Invisible
010045C1

Transparency
010045C1
010035C1

Have Tail Key
010111DB

Have Angler Key
010112DB

Have Face Key
010113DB

Have Bird Key
010114DB

Have Slime Key
010115DB

Have Nightmare Key
0101CFDB

Have Secret Medicine
01010DDB

Have Map
0101CCDB

Have Compass
0101CDDB

Have Stone Beak
0101CEDB

Have Magnifying Glass
010E0EDB