However, you can obtain Pokemon with dark typing in HeartGold through these methods:
* Trading: You can trade with players who have Pokemon from later generations that have the Dark-type. This is the most common way to obtain Dark-type Pokemon in HeartGold.
* Events: Occasionally, events may offer Dark-type Pokemon in HeartGold, such as Mystery Gift distributions or special events. However, these are rare occurrences.
Here are some Dark-type Pokemon you can obtain in later generations and trade to HeartGold:
* Umbreon: Evolves from Eevee with high friendship at night.
* Houndoom: Evolves from Houndour.
* Sneasel: Can be found in some areas.
* Murkrow: Can be found in some areas.
* Tyranitar: Evolves from Larvitar.
* Absol: Can be found in some areas.
Remember, you can only trade Pokemon that are compatible with the game you are playing. This means you can't trade Pokemon from Generation IV (Diamond/Pearl) or later directly to HeartGold. You would need to use a third-party trading system or someone with a Generation III game (Ruby/Sapphire/Emerald) as a middleman.
While you can't get "dark" Pokemon in the traditional sense, you can still enjoy the diverse roster of Pokemon available in HeartGold and explore the world of Pokemon through trading and events.