Smearguru is a colorful version of Smeargle in Pokémon Pokopia.
Smearguru is presented as a paint-covered, colorful character whose appearance reflects Smeargle’s established identity as the Painting Pokémon. The Pokopia version turns that artistic theme into a memorable neighbor with a bright, distinctive look.
The name Smearguru is not the name of a standard main-series evolution. It is a special named character used in Pokémon Pokopia, much like the game’s other unusual residents. This is why the answer is Smeargle: Smearguru is based on and described as a colorful Smeargle.
Kecleon and Grafaiai can also be associated with color or art-like visual themes, but they are different Pokémon. Smeargle is especially linked with painting because its signature move, Sketch, lets it permanently copy many other Pokémon moves.