>Falkner
Pidgey, Pidgeotto
>No Hoothoot/Noctowl
>Bugsy
Metapod, Kakuna, Scyther
>No Ledyba/Ledian, no Spinarak/Ariados
>Whitney
Clefairy, Miltank
>Morty
Ghastly, Haunter, Gengar, Haunter
>No Misdreavus
>Chuck
Primeape, Poliwrath
>No Hitmontop (This one is most baffling to me.)
>Jasmine
Magnemite, Magnemite, Steelix
>Pryce
Seel, Dewgong, Piloswine
>Clair
Dragonair, Dragonair, Kingdra
Out of the 22 Pokemon the Johto Gym Leaders use in total, only 4 are new Pokemon. 5 when counting Magnemite due to the steel type.
Just accept it. Johto Gyms were terrible.