Verified answer

i recommend evolving haunter into gengar ASAP. it has only beneficial improvements from trading. (more stats)

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What level should I evolve Haunter into Gengar?

I want to add a Gengar to my team. I have a Haunter that I can evolve, my only question is will Gengar be weaker if I evolve my Haunter at level 25? Haunter and Gengar both learn the same moves at the same level, but will their stats change for the worse if I don't level up my haunter to...

Gengar Evolution

Well my answer would to just evolve the haunter at level 25 and then train your gengar.

All right, well the stats wouldn't matter because at whatever level your Haunter evolves, it'll have the same stats trust me. And second, the only things you might wanna look at are there moves.

Haunter:http://serebii.net/pokedex-dp/093.shtml

Gengar:http://serebii.net/pokedex-dp/094.shtml

should train him a bit more evolve him around 36

i evolved mine as fast as possible cuz when u look at it all stats go up when evolved i think

you shouldnt take chances lv it in a high lv (50+)its better then indanger your haunter.nvm every1 says do it fast so listen to them lol.

You should evolve it once you finish EV training it, that way it should have the highest stats possible and if its IVs are high enough then it should have max stats.

it evoles with trade