Where can I find Larvitar & Mt. Moon Biomes?

I was near an apartment complex when I saw one on sighting but I could get in to catch it that is the only time I have seen them on sightings.

Eggs. From eggs.

I hatched a bunch of them when gen 2 first came out. As far as wild Larvitar, I see them in neighborhoods, same biome as Snorlax.

Also, I think Dragonite spawns in different locations than Dratini. I have never seen one in an area where I have seen the other. There are places that are known for spawning Dragonites, such as Rice Park in St. Paul and Lexington ave in Eagan.

I've never seen one in the wild (until today, during this rock event), but had enough to evolve a tyranitar solely due to hatches (especially two hatched during the easter event).

I found one Larvitar in a park, the other downtown in a place were all kinds of rare mon spawn occasionally.

Once every week or two I will see one at chik-fil-a on my way to school, near a pokestop with an image of three rocks lol

rock is the most common non trash in my area and i still get more larvitar by driving down to the coastal strip But do get one local once every few weeks.
coastal tourist areas have the best variety I get dratini, larvitar the odd mareep.

In order to get my Tyranitor, I hatched three eggs, caught three larvitar, and walked hundreds of Km with a larvitar as a buddy.