This code will let you control Moloch from MK Deadly Alliance as P1 Character.
Simply highlight the MK Deadly Alliance game in Dolphin Main Menu, right click it and press Properties the go to "AR Codes" click "Add" and add the code
in the field where it says:044186A0 00000008
"Insert Encrypted or Decrypted code here..."
then change it's name as "Play as Moloch P1" and enable it whenever you want to use Moloch.
Video Below.
I found this code I am not sure if a GameCube code for him exists but I do not claim any credit simply because this code does not deserve credits.
Not sure if it will run on Real GameCube console. Enjoy!