How do you catch celby and Pokemon HeartGold?

You can't catch Celby in Pokémon HeartGold! There is no Pokémon named "Celby" in the Pokémon world.

Perhaps you're thinking of another Pokémon? Here are some possibilities:

* Celebi: A Psychic/Grass-type Pokémon known for its time-traveling abilities. You can find Celebi in HeartGold by completing the "Time-Travel" event.

* Celebi: A Psychic/Grass-type Pokémon known for its time-traveling abilities. You can find Celebi in HeartGold by completing the "Time-Travel" event.

* Cloyster: A Water/Ice-type Pokémon that evolves from Shellder.

* Celebi: A Psychic/Grass-type Pokémon known for its time-traveling abilities. You can find Celebi in HeartGold by completing the "Time-Travel" event.

If you can provide more information about "Celby" or what it looks like, I might be able to help you figure out the Pokémon you're thinking of!