Unlike the Legendary Yo-kai from past games, the Yo-kai Medallium does not hold their Legend Pages, for they don't have any. The 'Merican Legendary Yo-kai must be found in the overworld and befriended like any other special event Yo-kai.
All of the 'Merican Legendary Yo-kai are based off of a normal Legendary Yo-kai:
The only 4 'Merican Legendary Yo-kai that were not introduced in the original anime series were Platinos, Flash T. Cash, Teducator, and Gentlemutt.
However, Koma Star and Flash T. Cash made their debut in Yo-kai Watch!, in EX007 and EX024 respectively.
As half of the 'Merican Legendaries were introduced in Yo-kai Watch 3, Gabby is the first time a Legendary of the Charming tribe is seen past a Legendary of the Heartful tribe.