When you use the Royal Rumble locker code included in a WWE 2K20 promotion, you’ll receive 15,000 VC that can be used in-game. The locker code itself does not unlock any Superstars, but instead provides you with the VC that can be used to purchase Superstars in-game.
You can use the locker code and unlock Superstars in-game by performing the following:
- From the main menu of WWE 2K20, select "Extras."
- Select "Locker Code."
- Input the Locker Code.
- After redeeming your VC, return to the main menu.
- Select "Store."
- Select "Purchasables."
- You can now select which Superstar you’d like to unlock.
As a side note, VC can be earned through various game modes.