Heart Gold and Soul Silver: (hidden) items, TMs, HMs and other

Pokemon HeartGold and SoulSilver Johto Pokedex

Pokemon SoulSilver HeartGold Map by Brittlebear on DeviantArt

Walkthrough:Pokémon HeartGold and SoulSilver, Pokémon Wiki

HG/SS daily & weekly events EASY to navigate map - Pokémon HeartGold Version Forum - Neoseeker Forums

The Best Grinding Spots in Pokémon HeartGold & SoulSilver – FandomSpot

Johto Route 43 - Bulbapedia, the community-driven Pokémon encyclopedia

Johto Route 45 - PokeMMO Wiki

Pokéarth - Kanto - Route 7

3 Ways to Capture All Three Legendary Dogs in Pokémon SoulSilver and HeartGold

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