well i hate my game so live with it
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Mt.Moon
Mew can't be catched in Pokemon heartgold, only mewtwo.
Certai pokemons that come from events are not needed to complete the pokedex. Such as: Arceus Mew Deoxis Manaphy etc...
If you somehow manage to get it on HeartGold, SoulSilver, Diamond, Pearl, or Platinum, you can trade it to Black
Of corse they do! Remember in the movie ''Lucario and the Mystery of Mew'' how Mew got sick? Exactly. And in Pokemon HeartGold Version when you have to help out that lighthouse Ampharos? Exactly. And when Ash threw up in Pikachu's face? Exactly.