Yes.
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Yes gastly learns mean look when he envovles to haunter
In the third generation Pokemon games, Haunter learns Mean Look at level 13. Because it doesn't evolve into Haunter from Ghastly until level 25, it is recommended for the player to catch or raise a Ghastly that knows Mean Look at level 13 before evolving it into a Haunter.
Zubat, Golbat, Gastly, Haunter, Gengar, Jynx, Crobat, Umbreon, Murkrow, Misdreavus, Smoochum, Sableye, Duskull, and Dusclops can learn mean look by leveling up. By breeding, Grimer, Muk, Ralts, Kirlia, and Gardevoir can learn mean look.
Zubat, Golbat, Gastly, Haunter, Gengar, Jynx, Crobat, Umbreon, Murkrow, Misdreavus, Smoochum, Sableye, Duskull and Dusclops all learn Mean Look by levelling up.
haunter learns it at level 34