Pokéarth - Kanto - Route 14

Pokemon HeartGold and SoulSilver :: Full Walkthrough

Johto Route 30 - Bulbapedia, the community-driven Pokémon encyclopedia

Kanto Route 28 - Bulbapedia, the community-driven Pokémon encyclopedia

Route 34 (From Pokémon Heartgold & Soulsilver) [Arrangement] - Single - Album by Pokestir - Apple Music

Walkthrough:Pokémon HeartGold and SoulSilver (Part 3), Pokémon Wiki

Pokéarth - Johto - Route 44

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

Pokémon HeartGold and SoulSilver/Goldenrod City — StrategyWiki

Pokémon HeartGold and SoulSilver/Johto — StrategyWiki

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