-To access the Hidden island surf east on Route 12

Leaf, May, Lyra:
-Starter
-Professor Oak's Aide in Cerulean City for capturing at least 15 kinds of Pokemon
-Reward for Quest from Professor Oak's Aide in Vermilion City.

Gardevoir:
-Trade in Cerulean City

Lass:
Kanto:
-Route 1,2, Celadon Gym
Johto:
-Route 9,10, Celadon Gym
Sinnoh:
-Route 15,18
Unova:
-Trade on Route 11, Safari zone, Cave on Hidden island, Route 28, Mt. Silver

Picnicker:
Hoenn:
-Viridian Forest, Route 3,24,25, Celadon Gym,
Johto:
-Celadon Gym, Route 17,18, Forest on Hidden island

Beauty:
Kanto:
-Route 5,6,9, Celadon Gym
Johto:
-Celadon Gym, Route 16,18
Sinnoh:
-Trade in Laboratory on Cinnabar Island, Mysterious Island

Breeder:
Hoenn:
-Route 24,25
Sinnoh:
-Route 12,13,14, Celadon Gym
Unova:
-Route 21,23

Parasol Lady:
Sinnoh:
-Route 11,12
Unova:
-Hidden Island Beach, Hidden Island Forest

Ranger:
Kanto:
-Diglett's cave, Rock Tunnel, Flooded Cave
Unova:
-Rock Tunnel, cave on Route 19, Hidden Island cave, Victory Road, Mt. Silver
Masters:
-Pokemon Mansion

Bird Keeper:
-Route 6,11,18

Psychic:
Hoenn:
-Route 24,25
Sinnoh:
-Route 17,18,
Unova:
-Pokemon Mansion

Swimmer:
Hoenn:
-Surf or fish on lake water
Johto:
-Surf or fish on sea water
Unova:
-Safari, Hidden island

Team Rocket Grunt
-Mt. Moon, Route 7,16

Aroma Lady:
-Route 24,25

Scientist:
-Power Plant, Pokemon Mansion

Hex Maniac:
-Only in night - Route 22,2,3,4,8,10. All day - Pokemon Tower

Idol:
-Route 4,16

Lady:
Kanto:
-Route 5,6,7 Celadon Gym
Sinnoh:
-Celadon Gym, Safari

Nurse:
-Route 22,11,12,13

Reporter:
-Trade in Cerulean City

Backer: (fire version, electric version)
-Route 7,8

Backpacker:
-Mt. Moon, Rock Tunnel, Hidden Island cave, Route 28, Mt. Silver

Cowgirl:
-Rock Tunnel, Route 8, Victory Road

Girlfriend:
-Route 13,14,15

Tourist:
-Route 13,14, Hidden island beach and forest

Channeler:
-Pokemon Tower

Waitress:
Sinnoh:
-Route 7,16
Unova:
-Route 14,15

Guitarist:
-Route 10, Power Plant

Battle Girl:
Hoenn:
-Route 10,16
Sinnoh:
-Safari

Crush Girl:
-Victory Road, Mt. Silver

Ace Trainer:
Kanto:
-Pokeball in the tall building in Celadon City, Safari
Sinnoh:
-Pokemon Mansion, Victory Road,
Unova:
-Hidden Island summit, Seafoam islands, Cerulean cave

Veteran:
-Mysterious Island, Cerulean cave

Daisy:
- Reward from rival for clearing Nugget bridge

Mom:
Quest on Route 1

Misty:
-Flooded cave on route 24

Erika:
-Celadon Gym

Sabrina:
-Pokemon Dojo in Saffron City

Whitney:
-Trade in Cerulean City

Clair:
-Hidden island summit

Ariana:
-Silph co. after beating Giovanni

Flannery:
-SS. Anne deck

Gardenia:
-Magikarp salesman

Elesa:
-Trade in Celadon City

Bryony:
-Trade in Saffron City after Silph co.

Dawn, Hilda, Rosa:
-Trade for Coins in Rocket card hall in Celadon City

Lusamine:
-Trade in Vermilion City

Caitlin:
-After defeating Koga and returning Teeth to warden speak to safari ranger in front of her empty cage.

Candice:
-After obtaining Caitlin use Rocket warehouse Key on Route 9.

Lorelei:
-After obtaining Candice and defeating Blaine speak to scientist in Cinnabar island and travel to
mysterious island

Jessie:
-After obtaining Lorelei and beating Viridian City Gym.

Cynthia:
-Mt. Silver after clearing Pokemon League for first time.

Peach:
-Speak with trainer next to Pokemon Day care on Route 5.

Evolutions:
-Leaf, May, Lyra, Nurse, Misty, Sabrina x 2, Lusamine, Caitlin - Level up
-Rocket Grunt - Use Prism Stone
-Hex Maniac - Use Dusk Stone
-Whitney - learn Milk Drink
-Elesa - Use Thunder Stone
-Peach - Use Fire Stone