>>42060391every non legendary snake pokemon besides serperior and onix are in the dragon egg group, and even then both learn a few dragon moves. Even then, you could easily argue that serperior is some other kind of legless lizard instead of a snake, and that onix is an earth worm instead of a rock python.
There's a very clear connection between snakes and dragons, and pokemon acknowledges it frequently.
Though OP's still a bit of a tard and runerigus shouldn't be part dragon. That's like saying mimikyu should be part electric or sudowoodo should be part grass.