Route 23

Walkthrough
After defeating your Rival for the second time on Route 22, you will finally be able to proceed on Route 23. Outside of the Badge Checkpoints, there is nothing to this path except for loads of Wild Pokemon and Items. Route 23 will lead you straight into Victory Road, the last test for your trainer before the Pokemon League.

Wild Pokemon
Grasses:
Nidorina (19%): Levels 41-46
Nidorino (19%): Levels 41-46
Fearow (15%): Levels 41-46
Exeggcute (14%): Levels 41-46
Spearow (10%): Levels 41-46
Nidoran F (10%): Levels 41-46
Nidoran M (10%): Levels 41-46
Nidoqueen (1%): Levels 41-46
Nidoking (1%): Levels 41-46
Exeggutor (1%): Levels 41-46

Grasses - Special Spawns:
Chansey: Levels 41-46

Waters:
Poliwag (45%): Levels 41-46
Magikarp (45%): Levels 41-46
Poliwhirl (10%): Levels 41-46

Sky:
Spearow (60%): Levels 3-56
Fearow (40%): 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

Obtainable Items
Golden Nanab Berries: Area After Vermilion Gym Badge Checkpoint
Golden Pinap Berries: Far Northwest Corner After Celadon Gym Badge Checkpoint
Golden Razz Berries: On Small Island After Fuchsia Gym Badge Checkpoint
Golden Nanab Berries: Grassy Area After Saffron Gym Badge Checkpoint
Golden Pinap Berries: Last Grassy Area After Cinnabar Gym Badge Checkpoint


Post Game
Walkthrough
After defeating the Elite Four and starting the Master Trainers Challenge, you will find a number of Master Trainers on Route 23. In total, there will be five Master Trainers to defeat.

Trainers
Lass Sal (Master Trainer): Level 75 Vensaur
Ace Trainer Edmund (Master Trainer): Level 75 Charizard
Ace Trainer Percy (Master Trainer): Level 75 Nidoqueen
Ace Trainer Carlton (Master Trainer): Level 80 Nidoking
Ace Trainer Jirard (Master Trainer): Level 65 Dratini