yes.
yes you can trade pokemon leafgreen pokemon to pokemon emerald version same as pokemon fire.
You have to trade it from Fire Red
YES
You can't. have to trade from fire red
No it's not possible. No method of trading where designed to trade between these games.
You have to trade with someone who has fire red.
you have to trade from fire red
Sorry, but you have to trade it from fire red.
Trade it from leafgreen or fire red
there are 151 between leafgreen and fire red
cant you have to either trade from pokemon leafgreen or fire red
you can't