Unfortunatly, not -.-
It is impossible to catch a Deoxys in the wild in HeartGold & SoulSilver. You need to get one at a Nintendo Event or transfer one from a GBA game. Theres a Deoxys mission in the 3rd Ranger game. Capture it and it will be comfortable in any 4th gen game.
No. Deoxys can only be caught in GBA games. To get Deoxys in HG, you need to transfer it from the Pal Park in Fuchsia City (I think) in Kanto or trade it from a game that does have one. However, I don't think the latter is very likely as Deoxys is a legendary pokemon and therefore quite rare.
Before I go on, I'd like to say that without a Cheating Device, you cannot get these Pokemon from HeartGold.Deoxys - Migrate from the GameBoy Pokemon Cartridges to Pokemon Pearl or Diamond by using the Pal Park. Afterwards, trade Deoxys to HeartGold or SoulSilver. (By the way, Deoxys can be found at Birth Island in the GameBoy Pokemon Cartridges.)Mew - It seems that Emerald is the only GameBoy Pokemon Cartridge that has Mew. Migrate Mew to Pokemon Pearl or Diamond, like Deoxys, and trade it to HeartGold or SoulSilver. (Mew can be found at Faraway Island in Emerald.)Celebi - Migrate from the GameBoy Pokemon Cartridges to Pokemon Pearl or Diamond by the Pal Park. Do the same with the others and trade Celebi to HeartGold or SoulSilver. (Nintendo Event is needed for this lovely Legendary.)
On the real fire red that is impossible, as garchomp only exists in pearl, diamond, platinum, heartgold, and soulsilver. Firered only goes up to #386 Deoxys
You cannot find Deoxys in Pokemon HeartGold. Deoxys has to be traded from another game to get into HeartGold. The rocks to the east of Pewter City are used to change Deoxys' forms, but you have to transfer one using Pal Park, first.
You cannot find Deoxys in HeartGold, or SoulSilver. You can only get Deoxys through trading or at a Pokemon Event.
Unfortunatly, not -.-
You can't
It is impossible to catch a Deoxys in the wild in HeartGold & SoulSilver. You need to get one at a Nintendo Event or transfer one from a GBA game. Theres a Deoxys mission in the 3rd Ranger game. Capture it and it will be comfortable in any 4th gen game.
No, it's only on E/FR/LG.
You cannot find a wild Deoxys in in Pokemon Soul Silver, or HeartGold. Deoxys can only be obtained by trading with someone or by getting one at special distributions.
Go to Pewter City and there are meteorites there. Check it and I think Deoxys will change form. (There are 4 rocks: for each of the 4 forms.)
Deoxys didn't exist when Pokemon Gold, Silver, and Crystal came out. If you meant HeartGold, then you'll need to migrate it or trade for it.
There is no such thing as a tree that leads to a man who gives you a Deoxys. You cannot get a Deoxys through normal game play in HeartGold. You must trade a Deoxys from another game.
There are meteors in between pewter city and mt.moon that can change deoxys form
No, Deoxys is only in Emerald, and you need to migrate it to can catch it. As for Celebi and Mew, you need a cheat code for them.