u got to talk to the manager of curulins city's powerplant in kanto
The machine is hidden in the Cerulean Gym
dowsing machine
In Ecruteak city in the house right of the Pokemon gym
Technical Machine it can only be used once and you can get lots of them.
you go to the gym and look around its near the tubes in the back
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
They are not in Pokemon HeartGold
If you have Celebi on Pokemon Diamond, Pearl, Platinum, HeartGold, or SoulSilver, you can use the PokeTransfer machine in Pokemon Black and White to transfer it.
where is the pokemon transfer lab in heartgold
Go to the Cerulean gym. Press A next to one on the piles of innertubes. On the west side of the gym i think.
No, but you can trade Pokemon only in HeartGold to Black