By Region:
* Johto Region (Main Story):
* All 100 Pokemon native to the Johto region (including legendary Pokemon like Entei, Raikou, and Suicune).
* Some Kanto Pokemon from Generation 1 that are found in the wild, in trades, or by breeding.
* Kanto Region (Post-Game):
* All 151 Pokemon from the Kanto region (Generation 1), including the legendary birds and Mewtwo.
* Special Encounters:
* Celebi: Can be encountered through a specific event in the game.
* Event Pokemon: Certain Pokemon might be available through limited-time events or special distributions.
Important Note:
* Version Exclusives: HeartGold is the "sister" game to SoulSilver. While you'll find most Pokemon in both games, there are some version exclusives. For example, HeartGold has access to the legendary birds Articuno, Zapdos, and Moltres.
* Breeding: You can breed Pokemon to get different variations and even get specific egg moves for your Pokemon. This unlocks a whole new layer of Pokemon possibilities!
* Trading: Through the Game Corner's wireless connection or with other players, you can trade Pokemon to complete your Pokedex and obtain Pokemon unavailable in the wild.
Beyond the Basics:
* Shinies: You can find shiny Pokemon (a rare color variation) in the wild. These Pokemon are very rare, but finding them is an exciting aspect of the game.
* Evolutions: You can evolve your Pokemon through various means, including level-ups, specific items, and even trading.
* Moves: Pokemon can learn different moves that can be used in battle. You can change their move sets by using TMs or HMs.
Resources:
* Bulbapedia: A comprehensive Pokemon database with detailed information on every Pokemon, including their locations and evolutions.
* Serebii.net: A website with guides, strategies, and information on all aspects of Pokemon games.
I hope this gives you a good understanding of what Pokemon you can encounter in Pokemon HeartGold! Happy catching!