Mean Look is a move that is only available to certain Pokémon, and Empoleon is not one of them.
Here's why:
* Type: Mean Look is a Ghost-type move. Empoleon is a Water and Steel type. Pokémon can only learn moves that are of their own type or are special moves they have a natural affinity for.
* Movepool: Empoleon's movepool is limited to Water, Steel, Flying, Electric, and Ice type moves, along with some status moves. Mean Look is not part of its regular learnset.
Therefore, Empoleon cannot learn Mean Look through any conventional methods.