Walkthrough
After defeating your Rival in Cerulean City, you can proceed on Route 24 in hopes of finding the talking Pokemon he mentioned. Route 24 connects to none other than Route 25, and it is home to what is known as Nugget Bridge. Trainers can be found across Nugget Bridge, ending with one that belongs to Team Rocket who will try to convince you to join their efforts. Loads of Wild Pokemon can also be found on Route 24.
Gift Pokemon
Charmander: Show Charmander Trainer You Have Caught 50 Pokemon
Wild Pokemon
Grasses:
Pidgey (20%): Levels 7-12
Venonant (20%): Levels 7-12
Meowth (20%): Levels 7-12
Psyduck (20%): Levels 7-12
Bellsprout (20%): Levels 7-12
Grasses - Special Spawns:
Squirtle: Levels 7-12
Waters:
Tentacool (45%): Levels 7-12
Magikarp (45%): Levels 7-12
Tentacruel (10%): Levels 7-12
Sky:
Pidgey (60%): Levels 3-56
Pidgeotto (35%): Levels 3-56
Pidgeot (5%): Levels 3-56
Sky - Special Spawns:
Dragonite: Levels 3-56
Charizard: Levels 3-56
Articuno: Levels 3-56
Zapdos: Levels 3-56
Moltres: Levels 3-56
Trainers
Bug Catcher Cale: Level 9 Venonant
Lass Ali: Level 10 Psyduck
Youngster Timmy: Level 10 Sandshrew
Lass Reli: Level 10 Meowth
Camper Kevin: Level 11 Growlithe
Team Rocket Grunt: Level 11 Zubat, Level 11 Koffing
Camper Shane: Level 11 Spearow
Obtainable Items
Poke Balls: Defeat Bug Catcher Cale
Poke Balls: Defeat Lass Ali
Poke Balls: Defeat Youngster Timmy
Poke Balls: Defeat Lass Reli
Great Balls: Defeat Camper Kevin
Nugget: Defeat Team Rocket Grunt
Great Balls: Defeat Camper Shane
Razz Berries: Near Camper Shane
X Sp. Def: West Of Hiker On Route 25
Post Game
Walkthrough
After defeating the Elite Four and starting the Master Trainers Challenge, you will find a few Master Trainers on Route 24. In total, there will be two Master Trainers to defeat.
Trainers
Bug Catcher Olly (Master Trainer): Level 70 Venonant
Lass Summer (Master Trainer): Level 70 Exeggcute