This must be an alternate Sonic whose MO is to make enemies keel over from his cuteness. He was doodled by kawacy, who otherwise specializes in anime-style art—his gallery is right here, if you want to check him out, and below’s a timelapse video depicting the painting process.
In June, designer Karolin Gu started drawing one Pokémon a day, posting the results on Instagram in what she calls “The Tiny Monsters” series. She’s currently at Tentacool, ie. #72, and plans to eventually draw every Pokémon in existence. Only a few hundred more to go! You can follow her progress here.