The story starts with a scene where STEVEN is teaching you about battling
with a pokemon. When you finish learning, you are asked for choosing one
pokemon from the three SINNOH starter. Then, you will have to defeat gym leaders, collect badges and so on untill
you met TEAM HUNTER, a team that lead by sixteen trainer which is known
as CHAOS SIXTEENTH. They try to collect plates from legendary Pokemon
to summon the God of the Pokemon, ARCEUS...

Adventurous and interesting storyline happened when you try to stop
them from summoning ARCEUS. You’ll have to face challenges, defeat
enemies and save the world...

Now, the explaination of CHAOS SIXTEENTH since lots of people don't understand what it means.

Spoiler
What is CHAOS SIXTEENTH?
CHAOS SIXTEENTH made up of 16 strong trainer. They created a team known as TEAM HUNTER to help them in collecting PLATES. Specific pokemon including Legendary Pokemon, holds the plate. CHAOS SIXTEENTH need these plates for their goal.

What is the GOAL?
They collect the plates to summon ARCEUS with the help of DIALGA and PALKIA.

Secret of CHAOS SIXTEENTH
CHAOS SIXTEENTH made up of 16 trainers which chase after plate holder each. But there is 3 more character controlling the whole group. There is 2 co-founder and founder. They are more stronger than the whole team.

Feature
- Brand new region to explore
- Interesting storyline
- Hero and Heroin from Pokemon Ranger
- All pokemon available to catch
- 3 starter from Sinnoh
- Get a National Pokedex at the beginning
- Catch legendary pokemon through its own story
- More choice than “Yes” or “No”
- Lots of Minigames
- PokeDevice instead of PokeGear or PokeNavi
- Mailing system replaced phone system ( maybe cancel )