Welcome to Pokémon Answers. What would you like to know?

"While battling it, you use a Pokéball on it. If you are successful, you have caught the Pokémon."

the above is WRONG!

A Gengar can only be obtained via trading a Haunter with somebody else. When haunter gets through the other end, it will Evolve into Gengar.

There are glitches which you could possibly use too. Google is your friend.

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