If you have action replay you can get any Pokemon you want.
This feature works only in Pokemon Heartgold , Soulsilver and Platinum.
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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