Uh-oh, Shadow Mario stole Chuckie Finster's girlfriend. Angelica also confirmed that he tried to impersonate Mario. They sent in the real Mario and he was grounded.
Chuckie Finster: Shadow Mario, how dare you steal my girlfriend!
Shadow Mario: So that means no second dates, right.
Angelica Pickles: Yes, and also I heard that you've been an impostor, impersonating Mario shamefully! I'm calling the real Mario and I'm never seeing you again.
Real Mario: Shadow Mario, how dare you steal Chuckie's girlfriend. It's even worse than impersonating me! That's it, you're banned from marrying Peach until Chuckie Finster and Angelica Pickles get married!