Which of these Pokémon cannot learn Surf?

Arbok cannot learn Surf because it is a snake-like Pokémon that lacks the physical capabilities to surf on water. Despite Arbok being a Poison-type Pokémon, it is not equipped with the necessary attributes or body structure to perform the surfing move. Surf is typically more commonly learned by Pokémon that have aquatic or amphibious features, such as Water-types or those with water-related abilities. Arbok, being primarily a Poison-type and having a more land-based design, simply does not possess the anatomical characteristics or abilities to learn and execute the Surf move.