My golbat evolved to crobat at 32 and when it leveled to 33 it didn't learn mean look. Is there some other way to learn mean look? - version is silver for game boy color
In Pokemon Silver, Crobat learns Mean Look at level 42. Perhaps you were looking at an updated version of the learnset.
Source: http://pokemondb.net/pokedex/crobat/moves/2
