I jumped on pokemon go 'gold fever' yesterday. So far I have noticed that fish-likes are spawning near the sea very well.
What sort of terrain would one look for Dratini?
Dratini are also water-dwelling. They're a little on the rare side.
Several weeks ago, Dratini were commonly documented in "nests," where clusters of them would be found with good frequency, but such nests have all since been rotated to hold different Pokémon. That said, there are still sparing sightings of Dratini clusters. You may be able to ask around and see if anyone else playing the game in your area has seen them.