Murkrow will learn mean look at level 48
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Murkrow learns it at 41. If you've already evolved it into Honchkrow you'll have to take it to the move relearner.
In Pokémon Platinum, the Pokémon that can learn Mean Look via level up would include Zubat and its evolutions, Gastly and its evolutions, Smoochum and its evolution, Umbreon, Murkrow, Misdreavus, Sableye, Duskull and its two evolutions of Dusclops and Dusknoir.
Rattata does not learn Mean Look.
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.
level 33