Is there any action replay codes for Avatar The Burning Earth?

Yes, there are. Here's the ones I have found:

@Max Cash

020c55cc 0000270f

@Character 1 (Aang) Code:

@Max & Full Health

020c5510 03e703e7

@Max Power

220c5514 000000c7

@Max Defense

220c5516 000000c7

@Max Special

220c5518 000000c7

@Character 2 Codes:

@Max & Full Health

020c5510 03e703e7

@Max Power

220c5514 000000c7

@Max Defense

220c5516 000000c7

@Max Special

220c5518 000000c7

@Character 3 (Katara) Codes:

@Max & Full Health

020c5570 03e703e7

@Max Power

220c5574 000000c7

@Max Defense

220c5576 000000c7

@Max Special

220c5578 000000c7

@Character 4 Codes:

@Max & Full Health

020c55a0 03e703e7

@Max Power

220c55a4 000000c7

@Max Defense

220c55a6 000000c7

@Max Special

220c55a8 000000c7