Vermilion City

Vermilion City is a big city in Kanto region which is introduced for the first time in. The place is not visited at the time. Instead, found a book in a Poké Center named "The Story of Rabbie Fragola". The events took part in this area, as Rabbie Fragola and the other people involved were living in this city in late 1800's.

Part Red & Green
According to the flashbacks in, after Rabbie Fragola and other members of The Revision are arrested, they are put in prison in Vermilion City. Fragola stays there until the day Fragola and the others are decided to be executed. However, Fragola escaped with a Pidgeot in the end, leaving others behind.