That's Professor Birch not Brock -_-. Edit: I changed the caption.
It's a bit unprofessional to complain. If you spot a problem, just fix it. Don't disrespect the wiki editor. You can let them know or quietly fix it.
@takashichea: Of course I will fix it if spot an error in the caption of a picture! Thanks for reply me, takashichea ^_^.
I only just now noticed the goatee. To be fair Brock and Professor Birch had similar moments with Muk and look a lot alike.
@EganTheVile1: Can you tell me which episode show Muk have an affection on Brock? I don't see many similarities between Brock and Professor Birch in their designs. I think you mean't Professor Oak who have this moment with Muk not Brock -_-!
The Muk caught and trained by Ash Ketchum. It smells horrible, so much so that the smell seeps out of the poke ball when Muk is inside, for this reason alone, Ash usually does not keep Muk with him and only uses it in tournaments and gym battles.
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