Is there a cheat to get the azure flute?

Yes, there is. Here are the steps:

1. Press down L2 and R2 and push right on the analog simultaneously

2. Wait for the game to freeze and then press up

3. Enter the following: 101C590C 0009

4. Press start to unfreeze the game

5. Go back to the screen with Ralph (first screen)

6. Press Right, Up, Left, Down

7. Choose the top option on the screen that appears

8. Use the analog to select the Azure Flute