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My reasons are probably as pathetic as OP's
This guy. I never had any friends who could help me to evolve it to Gengar. Gengar was so cool but i never had him.
Then i started to think that in pokemon world Haunter and me could be a perfect bros. May be he didn't evolved into gengar yet, but he is sure cool and will do anything to be the best, just like Ash' pikachu. After many years of playing i stopped being crazy over Gengar and Haunter become my all time favorite bro because he was in every game with me.