Super Crown

==Canon in Mario series==
The Super Crown is a power-up item that made its debut in New Super Mario Bros. U Deluxe. It is a puffy, mushroom-like pink headgear surrounded by a golden chaplet with eyes, exclusively used to transform Toadette into Peachette. The Super Crown's top appears to resemble the mushroom head of Toadette, being pink with white spots. When the crown is on top of Peachette's head, however, the crown itself transforms alongside her. The crown shrinks to fit her head, the eyes disappear, and the pattern on the top changes to four small white spots rather than two large white ones.
==Canon in Mushroom City Car Wash==
The Super Crown is a power-up that has recently showed up in Mario's adventures. They used to be made by Princess Peach's power-up factory until Bowser stole the entire stock of them. After he got them, he modified their purpose, so that anyone, including Toadette, could turn themselves into a princess. After the Mario Bros. stopped him and returned the crowns to the princess, she sought to destroy every single one of them by throwing them through a erasing device, and rid the Mushroom Kingdom of this deadly power-up. 
Soon, only one remained, a very special crown that was guarded by Toadsworth. However, one day he decided to bring the last Super Crown to the Mushroom City Car Wash, so that they could keep it in their vault, away from the destructive princess. After he gave it to them, Toadette put it inside the vault, hoping that no one would take it. Meanwhile, Toadsworth returned to Peach's Castle, only to find the princess in a complete fit of rage. After making her Toads chase after Toadsworth, she went to the Car Wash to get the crown back. 
Back at the Car Wash, Nitros Oxide and the Baby Pokémon stumbled upon the item in the vault while they were cleaning the Car Wash. Curious, the Pokémon wanted Oxide to try it on, so they could see how it worked. However, the alien denied to do so, forcing the Pokémon to force it onto his head. After a few seconds, he transformed into Oxette, a human girl with green hair and a purple dress who only cared about her appearance. Horrified at they had done to their caretaker, the Pokémon tried to get the crown off, but to no avail. After Oxette entered the bathroom to get ready for something, Zem ordered Zam to bite Oxette's hair, allowing the crown to fall into Princess Peach's hands, and take it back to her castle successfully. After the crown left the Car Wash, Oxide started to neglect the Pokémon until their death in Isle Delfino. No one knows what happened to the crown after it left the Car Wash, but it is presumed that Peach destroyed it, ending its existence for good.