>>43362475Only Agatha.
Giovanni: was Bird, became Ground
Koga: was Ghost, became Poison
Agatha: was Eeveelutions, became Ghost
Hypothesized, but scant evidence:
Coleman: was Psychic, became Fire
(Because of his gym puzzle, and his placement in the trainer class list )
>19. Fire (Psychic)Sabrina: was (Poison or Fire?), became Psychic
(Because of the badge she gives you, (Marsh/Gold). I say Fire because of her red clothes in the anime.)
Lt. Surge: was (Water or Normal?), became Electric
(assuming he taught you Surf or Cut, and his gym was originally the St. Anne)
Misty: was Ice, became Water
Yujirou: was Electric, removed from game
Brock: replaced Yujirou, Rock
Before they formally added Types to the games, Gym leaders could have used anything.