Put in a Pokemon GBA cartridge in the GBA slot (Ruby/Sapphire/Emerald/FireRed/LeafGreen) and then go to the Haunted Mansion in Eterna Forest, inside you will have a very rare chance of finding a Gengar.
Have someone trade you a haunter.
Gahstly will evolve at lvl25 to Haunter then trade haunter to evolve to a Gengar.
Using the FireRed Dongle method, in Diamond and Pearl you will find Caterpie, Metapod, Ekans, Arbok, Growlithe, Elekid and Gengar and in Platinum you'll find Caterpie, Metapod, Ekans, Arbok, Growlithe and Gengar.
For Diamond and Pearl Fantina has: Drifblim Gengar Mismagius For Platinum she has: Duskull Haunter Mismagius
you can find gengar in victory road as you enter use rock climb and there i a physic train with it but in pearl and diamond fanita has it
Have someone trade you a haunter.
Sorry to say, but Gengar is not obtainable in the wild.
you trade him. and he will evolve into gengar. you trade him. and he will evolve into gengar.
Get a Haunter and trade it with a friend in the Union Room, then it will evolve into Gengar if it doesn't have an everstone.
To get Gengar you must link trade Gastly with a friend that has a 4th generation game (Diamond,Pearl,Platinum,Heartgold,Soulsilver) and then it will evolve into gengar.
no
level 50
yes except gengar he can faint if a foe has a empoleon
Yes at the Hearthome gym leader's trainers.
Drifblim (Lv. 32), Gengar (Lv. 34) and Mismagius (Lv. 36).
You trade Haunter to another Diamond, Pearl, or Platinum version and it will evolve into a Gengar. You will need to trade back to your original Diamond game to get the Gengar. Hope I helped, bye
You can use the Pokemon modifier for action replay but I don't know the code right now.