Gen 1&2 catchable Pokemon in Heartgold

Question

I will start playing Heartgold, but no trading will occur with outside of the game itself.

My goal, except from becoming the very best ( :) ), is to catch all the available Gen 1 & 2 Pokemon in this game, and evolve them as much as I can.

Do you know which these Pokemon are? I cannot find a concrete list while surfing the Internet..

Studoku · Accepted Answer

All of generation 1 & 2 can be acquired in either HeartGold or SoulSilver. However, with just HeartGold some will be unavailable.

The 2 Johto and 2 Kanto starters (and their evolutions) that you didn't choose will be unavailable. You need to trade to get the ones you didn't select.
Vulpix, Ninetales, Meowth, Persian, Kabuto, Kabutops, Ledyba, Ledian, Skarmory, and Delibird are unavailable, as they are SoulSilver exclusives.
Mew and Celebi are only available from giveaways, so it is unlikely you will be able to catch them.
Alakazam, Machamp, Golem, Gengar, Politoed, Slowking, Kingdra, Scizor, and Porygon 2 require trading to evolve. Steelix can still be encountered and caught without having to evolve Onix.
You can get all of Tyrogue and Eevee's evolutions by breeding them with a Ditto, so all 3 himons and all 5 eeveelutions are possible in one game.

This leaves a total of 33 unacquirable Pokémon. You can consider your Pokédex complete at 223.

Source for version exclusive lists: HeartGold/SoulSilver Version Exclusive Pokémon on Bulbapedia

gsamaras · Answer

The number of catchable Pokemon in Pokemon Heartgold is 216.
Studoku's answer is almost correct (see comments).

Gen 1&2 catchable Pokemon in Heartgold

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