Sootopolis City is located in the crater inside a dormant volcano, which is said to be where a meteor hit thousands of years ago when Primal Groudon & Kyogre existed. As such, this city requires you to Dive to get into it. In the middle of the city there is a massive pool of water, with the residents living in buildings on the sides. It gives access to the special Cave of Origin, where there is also a large tree which was donated by AZ, who had visited from Kalos long ago.

Move Tutor
In the north-eastern part of Sootopolis City is a house with this elderly gentleman within it. If you speak to him with a Dragon-type Pokémon of high happiness, he will teach it the special move, Draco Meteor.

Name	Type	Cat.	PP	Att.	Acc.	Effect
Draco Meteor			5	130	90	Comets are summoned down from the sky. The attack's recoil sharply reduces the user's Sp. Atk stat.

Gym
The Sootopolis Gym is the final gym of the region and features a puzzle where you need to move around an icy platform, making each tile crack before getting to the end. If you step on the same tile twice, you will fall into the bottom floor. Get to the end and you will face the Gym Leader; Wallace. Defeat him, and you'll earn the Rain Bridge and HM05, Waterfall

Special Moves used in Sootopolis City:
Surf
Dive

Overworld Scannable Pokémon