Non-matching Pokémon used by Type Specialist Gyms(Common Trainers only):

Note: Stadium games are not listed for obvious reasons.

Gen I:

1. Pewter Gym: Diglett and Sandshrew
2. Fuchsia Gym: Drowzee, Hypno, Kadabra, Sandslash
3. Saffron Gym: Gastly, Haunter
4. Viridian Gym: Arbok, Tauros, Machoke, Nidorino, Machop

Gen II:

1. Pewter Gym: Sandslash
2. Goldenrod Gym: Snubbull
3. Mahogany Gym: Seel, Shellder
4. Blackthorn Gym: Horsea, Seadra

Gen III:

1. Pewter Gym: Sandshrew
2. Fuchsia Gym: Drowzee, Hypno, Kadabra, Sandslash
3. Saffron Gym: Gastly, Haunter
4. Viridian Gym: Arbok, Tauros, Nidorino, Machop, Nidorina
5. Mauville Gym: Meditite, Gulpin, Zigzagoon, Volbeat, Illumise
6. Lavaridge Gym: Kecleon, Meditite, 
7. Sootopolis Gym: Azurill

Gen IV:

1. Goldenrod Gym: Snubbull
2. Mahogany Gym: Seel, Shellder
3. Blackthorn Gym: Horsea, Seadra
4. Pastoria Gym: Azurill
5. Canalave Gym: Skorupi and Azumarill
6. Snowpoint Gym: Tentacruel, Golduck, Pelipper, Steelix, Floatzel, Quagsire, 
7. Sunyshore Gym: Mr. Mime, Bibarel, Steelix, Medicham, Kadabra

Gen V:

1. Striation Gym: Purrloin

Gen VI:

1. Mauville Gym: Meditite
2. Lavaridge Gym: Kecleon, Meditite, Koffing