you can't
haunter evolves into genger by being traded you only can it evolve by trading your haunter
im guessing u mean haunter, and u must trade it to evolve it into gengar, which sucks if u dont have anyone to trade with, or are playing a rom.
you can evolve scyther by making it hold a metal coat which you find after beating the elite 4.make scyther hold it and trade it but then trade it back to you to make it evolve.
ditto does not evolve on firered or leafgreen
That item doesn't exist in leafgreen.
They evolve by trading.
yes by trading
It won't evolve without trading
Yes. With AR.
You evole haunter by trading it with a friend :D
By trading it while holding the item Metal Coat.
Haunter doesn't evolve at a level. It evolves by trading with another trainer.
You cannot evolve without trading, you should just trade with lots of people until you get a gangar
Machoke, Kadabra, Graveler, Haunter... Loads...
You need to trade it to another game to evolve it, it's okay if you trade it back afterwards.
Golem can only be obtained by trading a Graveler and making it evolve.
haunter evolves into genger by being traded you only can it evolve by trading your haunter