These two Pokémon in Pokémon GO don't look anything like the actors / martial arts experts they are named after, but that's not how the visual gestalt of Pokémon works. These two are fighting-type Pokémon, and "hitmon" is probably supposed to sound like "hit-man", not as in assassin, but as in "hit a person" as in martial arts (a bit rough, as martial arts is about much more than just hitting people). When you then see "Lee" and "Chan", it's clear this is an homage to the martial arts greats of movie fame, Bruce Lee and Jackie Chan.
