Who: Brock
Where: Pewter City
Prizes: Boulder Badge (gives your Pokémon a slight power boost). TM 34.

Who: Misty
Where: Cerulean City
Prizes: Cascade Badge (makes any Pokémon up to level 30 obey you). TM 11.

Who: Lt. Surge
Where: Vermilion City
Prizes: Thunder Badge. TM 24.

Who: Erika
Where: Celadon City
Prizes: Rainbow Badge (any Pokémon up to level 50 will obey you). TM 21.

Who: Sabrina
Where: Saffron City
Prizes: Marsh Badge (makes any Pokémon up to level 70 obey you). TM 46.

Who: Koga
Where: Fuchsia City
Prizes: Soul Badge (slightly boosts the defense of all your Pokémon). TM 6.

Who: Blaine
Where: Cinnabar Island
Prizes: Volcano Badge (boosts the power of all your creatures' special attacks). TM 38.

Who: Giovanni
Where: Viridian City
Prizes: Earth Badge (all Pokémon will obey you). TM 27.