How to Evolve Haunter

Gengar is a powerful Ghost-type Pokémon that evolves from Haunter that can be difficult to acquire. You'll need to catch or trade for a Haunter (or Gastly, if you don't mind leveling it) and then trade that Haunter to someone else to trigger its evolution. Haunter isn't available in all games, so you may not be able to find it without a friend or trading buddy.

Steps

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How.com.vn English: Step 1 Catch or trade for a Haunter or Gastly.

Depending on the version of Pokémon you are playing, you may or may not be able to find a Haunter or Gastly in the wild. If you get a Gastly, level it up to Level 25 to evolve it into a Haunter.^{[1]XResearch source}

Game	Location
Red Blue Yellow	Pokémon Tower
Gold Silver Crystal	Route 8 (Night)
Ruby Sapphire Emerald	Trade only
FireRed LeafGreen	Pokémon Tower, Lost Cave
Diamond Pearl Platinum	Old Chateau
HeartGold SoulSilver	Route 8, Safari Zone (Night)
Black	Trade only
White	Catch and evolve Gastly
Black 2 White 2	Trade only
X Y	Route 14, Route 19, Frost Cavern, Victory Road
Alpha Sapphire Omega Ruby	Trade only
Sun Moon Ultra Sun Ultra Moon	Abandoned Thrifty Megamart

2
Trade your Haunter to a friend. Haunter evolves into Gengar when it is traded, so you'll need someone that you can trade with that you trust will trade it back to you. The method for trading varies depending on the version of Pokémon you are playing.
- In Sun, Moon, Ultra Sun, and Ultra Moon, you can trade Pokemon by selecting Festival Plaza in the menu after you've reached the Pokemon Center in Hau'oli City. Select Link Trade to trade with a friend or guest. Both you and your trading partner need to select Quick Link in the menu and press down on the touch screen. Then select Trade. You can do this any where in the Alola Region. ^{[2]XResearch source}
- In Black, White, Black 2, White 2, X, Y, Alpha Sapphire, and Omega Ruby, you can you can trade Pokemon at the Global Trading Station.
- In Diamond, Pearl, and Platinum you can trade Pokemon using a pal pad in the downstairs of any Pokemon Center.
- If you are using John GBA Lite, you cannot trade with other user's but you can trade with yourself using another game file.
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Once the Haunter is traded it will evolve into a Gengar. Have your friend trade it back to you so that you can use it.

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Question
Where do I go to trade Pokemon with trustworthy people?
Community Answer
There is really no place to trade with trustworthy people. Although, the best way of doing that is to trade with the people you have on your friends' list if you have one.
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Question
Does it have to be traded?
Community Answer
Yes, it has to be traded.
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Does Haunter need to hold an item while being traded?
Community Answer
No. Haunter can be traded with or without an item.
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