Gelateria

From the Super Mario Wiki

The Gelateria is a restaurant in Diamond City that serves gelato, and it is run by Manager Joe, known as Gelato Joe at the time. It is also the location of Mona's first job. It has only been seen in first WarioWare Inc. game, WarioWare, Inc.: Mega Microgame$!.

In the first game, defeating each character's level of microgames will have that character show up at the Gelateria to hang out, and they will stay there even after the player beats the entire game. Wario doesn't appear until after his second level, the final level in the game.