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If by best you mean Pokemon I consider my favorite
and by
on average you mean as a percentage of the total Rock types
then yes.
Alola was interesting for me in that it was the first time in the history of the games where none of the Rock types introduced appealed to me, however considering only 4 were and then 1 more in the enhanced version made it unlikely.
But if we're talking about the individual designs of Rock types that I like, I would disagree. The best individual Normal, Psychic, Flying, Water, Ground, Grass, and Dragon types are better on average than the most individual Rock types.