Kanto Route 26 - Bulbapedia, the community-driven Pokémon encyclopedia

Kanto Route 24 - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon HeartGold and SoulSilver Versions - Bulbapedia, the community-driven Pokémon encyclopedia

File:Project Routes logo.png - Bulbapedia, the community-driven Pokémon encyclopedia

Underground Path (Kanto Routes 7–8) - Bulbapedia, the community-driven Pokémon encyclopedia

The Full Coherent Pokemon Timeline : r/GameTheorists

File:Kanto Route 11 RBY.png - Bulbapedia, the community-driven Pokémon encyclopedia

Improvements as clear as night and day! Let's Play Pokemon Crystal - The Something Awful Forums

Kanto Route 15 - Bulbapedia, the community-driven Pokémon encyclopedia

Kanto Route 27 - Bulbapedia, the community-driven Pokémon encyclopedia