Tyranitar does not spawn in the wild. Instead you can catch Pupitar and evolve it into Tyranitar. A popular spawn location you can find Pupitar is in the Lake of Outrage area with a 2% chance to spawn during Sandstorm weather.

Where can I find tyranitar in Pokemon go?

Tyranitar is a level 4 raid boss, and raids are the most popular way to capture him. If you can gather enough people and beat the raid leader, you might be able to get a decent IV Tyranitar.

How do you evolve Larvitar into tyranitar?

Even though the Pokedex states that Larvitar evolves after consuming an entire mountain, you won't need to accomplish this with yours for it to change. To evolve your Larvitar into a Pupitar, simply train it until level 30. Then, once it's a Pupitar, it'll evolve again into Tyranitar at level 55.