Here's why you can't get swarms in HeartGold:
* Different Game Mechanics: HeartGold uses different game mechanics compared to newer generations. Swarms were implemented as a way to encourage exploring the region and encountering different Pokémon.
* No Specific Feature: HeartGold doesn't have any specific features that would trigger a swarm event.
While you can't find swarms, HeartGold offers a variety of other ways to encounter Pokémon:
* Random Encounters: You'll encounter Pokémon randomly in the wild as you explore different areas.
* Specific Locations: Certain Pokémon are found only in specific locations, like the Safari Zone or the Lake of Rage.
* Breeding: You can breed Pokémon to obtain specific eggs that will hatch into desired Pokémon.
* Trading: You can trade Pokémon with other players to expand your collection.
Enjoy catching Pokémon and exploring the world of Johto!