You need to trade for one from a friend or someone.
You cannot get Genger on Pokémon Leaf Green although you can trade for it with another player. You can however get Gastly, which is Genger's pre-evolution.
it is freakin fantina... duuuuuuuuuh!
nobody but u can get a gastly and evovle it
in the top left corner of snowpoint city
go to the uniuon room (upper floor in Pokemon centre) then go wirth a friend and trade hope this helps
Pokemon tower in lavender city, keep moving around and you will find one.
haunter evolves into genger by being traded you only can it evolve by trading your haunter
Pokemon cannot learn Yawn in Pokemon Silver.
Yes, you can find genger in the Victory road there is a trainer under the fisrt bridge you into in the Victory Road.
Gengar is catchable in Pokemon Platinum. They are in the Old Chateu room with the eye on the wall. You must have a Pokemon GBA game in the GBA slot for them to appear though. You can also get them by trading a Haunter at any level. After the trade it will evolve no matter what unless it has an Everstone.
you can get celebi from a Pokemon silver event
Lugia