I feel like this is so obvious it should goes without saying, but since so many people have been easily fooled already, lets do a quick run down.
This is Pokehidden:
This is PokeFound:
Note the dead (lightless) enlarged eyes, the at times overly thick lines, and the overall lack of polish compared to the actual Pokehidden.
Couple that with the fact that Pokehidden left specifically because he hated this kind of style, and you have a clear cut emulator, one that's using his name for both an easy attention grabber and rise to popularity.
Updated by Moon Moon