This could almost pass for a matataku drawing.

Best monster to used in "who's that Pokemon?"

Which mostly would fall for Geodude when it's not

So apparently, this isn't art of just any Gaboo. This is Oakleyman, an infamous monster from Monster Rancher 2 that can be encountered in Rank E tournaments. This monster is unusually strong for his rank and is a roadblock for breeders very early in their current monster's fighting career. Some breeders even reported their monsters dying right after fighting him.

Blank_User said in comment #2485519:

So apparently, this isn't art of just any Gaboo. This is Oakleyman, an infamous monster from Monster Rancher 2 that can be encountered in Rank E tournaments. This monster is unusually strong for his rank and is a roadblock for breeders very early in their current monster's fighting career. Some breeders even reported their monsters dying right after fighting him.

Oakleyman the Gaboo from Monster Rancher vs Whitney's Miltank from Pokémon, who's gonna win?