Pokéarth - Kanto - Route 14

Pokemon HeartGold and SoulSilver Johto Pokedex

Johto Route 34 - PokeMMO Wiki

Johto Route 29 - Bulbapedia, the community-driven Pokémon encyclopedia

Johto Route 38 - Bulbapedia, the community-driven Pokémon encyclopedia

Pokéarth - Johto - Route 32

Pokémon HeartGold Walkthrough Part 52: Fixing the Power Plant

Pokemon HeartGold / SoulSilver Walkthrough - Part 17 - Route 36 & Sudowoodo

Here is a map I made with the location and info for all catchable Pokemon in Sun and Moon : r/pokemon

Walkthrough:Pokémon HeartGold and SoulSilver (Part 4), Pokémon Wiki

Route 30 - Pokemon HGSS Sheet music for Piano, Trombone, Tuba