In Pokémon Gold and Silver and also in Pokémon Crystal which expands a little on this. You can give a trainer you beat your phone number and they will call you back to talk, battle again, tell you when super rare pokémon are common, and/or in crystal give you a item, which for the first time a randomly after that are evolution stones. The exception to this is bug catcher: wade. Here is a list of Trainers and their phone numbers.
| Trainer: | Location: | Gives/Tells: | Version: |
| Youngster: Joey | Route 30 | Nothing Special | GSC |
| Bug Catcher: Wade | Route 31 | Calls you to give you a berry. | C |
| Picnicker: Liz | Route 32 | Nothing Special | GSC |
| Fisherman: Ralph | Route 32 | Calls you when Qwilfish Swarm. | GSC |
| Hiker: Anthony | Route 33 | Calls you when Dunparce Swarm. | GSC |
| Picknicker: Gina | Route 34 | Calls to give Leaf Stone and other items | C |
| Camper: Todd | Route 34 | Calls when there is a sale at Goldenrod Dept. Store. | C |
| Bill* | Goldenrod City | Status of your Box on the PC. | GSC |
| Juggler: Irwin | Route 35 | Nothing Special | GSC |
| Bug Catcher: Arnie | Route 35 | Calls you when Yanma Swarm. | GS |
| Schoolboy: Alan | Route 35 | Calls to give Fire Stone and other items | C |
| Schoolboy: Jack | National Park | Nothing Special | GSC |
| Poké Fan: Beverly | National Park | Calls to give Nuggets | GSC |
| Lass: Dana | Route 38 | Calls to give Thunder Stone and other items | C |
| Schoolboy: Chad | Route 38 | Calls you when Snubbull Swarm. | GS |
| Poké Fan: Derek | Route 39 | Calls to give Nugget | GSC |
| Sailer: Huey | Lighthouse | Nothing Special | GSC |
| Fisherman: Tully | Route 42 | Calls to give Water Stone and other items | C |
| Picnicker: Tiffany | Route 43 | Nothing Special | GSC |
| Poké Maniac:Brent | Route 43 | Nothing Special | GSC |
| Fisherman: Wilton | Route 44 | Calls you when Remoraid Swarm/Calls to give you an Item. | GS/C |
| Bird Keeper: Vance | Route 44 | Nothing Special | GSC |
| Hiker: Parry | Route 45 | Calls you when Marill Swarm. | GS |
| Blackbelt: Kenji | Route 45 | Nothing Special | GSC |
| Picnicker: Erin | Route 46 | Nothing Special | GSC |
| Birdkeeper: Jose | Route 27 | Nothing Special | GSC |
| Cool Trainer: Reena | Route 27 | Nothing Special | GSC |
| Cool Trainer: Gaven | Route 26 | Nothing Special | GSC |
| Cool Trainer: Beth | Route 26 | Nothing Special | GSC |
| Disc Jockey Buena* | Goldenrod City | Nothing Special | C |
*Bill/Buena will give you his phone number but does not battle
Note: These trainers are in all 3 versions (GSC) but what they do aren't. For example 3 of the 6 super rare pokémon are common in pokémon crystal, so naturally they won't call about it. That is why a few things are GS only.
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