Walkthrough
Viridian Forest is a large forest located in between Route 2. Here, loads of Wild Pokemon, primarily Bug Types, can be found. There are also a number of trainers you can face in battle found within Viridian Forest, most of which will reward you with Items, usually Poke Balls, if you defeat them. You must get through Viridian Forest to proceed to the northern portion of Route 2, in hopes of eventually reaching Pewter City.
Wild Pokemon
Grasses:
Caterpie (25%): Levels 3-6
Weedle (24%): Levels 3-6
Pidgey (15%): Levels 3-6
Metapod (10%): Levels 3-6
Kakuna (10%): Levels 3-6
Bellsprout (10%): Levels 3-6
Pikachu (5%): Levels 3-6
Beedrill (1%): Levels 3-6
Grasses - Special Spawns:
Bulbasaur: Levels 3-6
Trainers:
Bug Catcher Brian: Level 3 Weedle
Lass Joana: Level 4 Rattata
Bug Catch Rick: Level 3 Caterpie
Lass Brittany: Level 4 Nidoran F
Bug Catch Doug: Level 3 Kakuna
Lass Jocelyn: Level 4 Pidgey
Bug Catch Sammy: Level 3 Metapod
Obtainable Items
Antidote: Near Entrance Sign
Poke Balls: Defeat Bug Catcher Brian
Poke Balls: Far Southwest Corner
Poke Balls: Defeat Lass Joana
Poke Balls: Defeat Bug Catcher Rick
Razz Berries: Far Southeast Corner
Poke Balls: Defeat Lass Brittany
Poke Balls: Defeat Bug Catcher Doug
Poke Balls: Defeat Lass Jocelyn
Lure: Opening In Northwest
Poke Balls: Defeat Bug Catcher Sammy
Tiny Mushroom: Southwest Area
Potion: Hidden Behind Tree In Northeast
Post Game
Walkthrough
After defeating the Elite Four and starting the Master Trainers Challenge, you will find a couple of Master Trainers within Viridian Forest. In total, there will be two Master Trainers for you to defeat.
Trainers
Bug Catcher Scott (Master Trainer): Level 65 Weedle
Lass Ikue (Master Trainer): Level 75 Pikachu