you can trade once you have given elm the egg that you got from mr Pokemon
yes actulay.
You'll need to trade for it from Pokemon Silver, or the older GBC games.
Either have it as a starter in Pokemon Gold, Silver, Crystal, Soul Silver, or Heart Gold. In Pokemon LeafGreen and FireRed you'll need to trade a Pokemon for it. Also in Pokemon Sapphire, Ruby, and Emerald. In Pokemon Diamond, Pearl, and Platinum you have to trade a Pokemon for it. Hope this helps!
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.
You need to trade it from soul silver or heart gold if you choose it after beating 'red' on mt silver
Another person would need to trade with you to get all 3 Starter Pokemon.
There is no NPC who you can trade a Haunter to for a Gengar in Pokemon Crystal. To get Gengar you will need to trade with another player or a copy of Pokemon Gold, Silver or Crystal.
you need to migrate it from Pokemon diamond/pearl/platinum. it is unobtainable in soul silver/heart gold trade, not migrate
cyndaquill is a starter Pokemon such as totodile and chicorita for Pokemon silver and gold so I THINK on leaf green you know the islands bill takes you to he could be there or maby you need to trade but you cant trade between gameboy and gameboy advanced hmmm........I got an idea wait till Pokemon heart gold and soul silver come out they are the DS version of the gameboy game Pokemon gold and silver!!!
you need to games of any pokemon game to trade
You can insert FireRed, LeafGreen, Emerald, Gold or Silver and transfer through Pal Park to get the Pokemon you need. You can also go to the GTS and trade Pokemon from around the world.
you have to trade it from Pokemon red to silver (u need the time machine) then trade it from silver to any version and so on :)