50 years ago a far away for a secretely Island of Orange Island, lived a nobles. One day the King and Queen get a two sons. Life was a normal at that time, the boys grown up. The older son was choised to be a his fathers next heir, but he was mostly interested to become a pokemon trainer and travel toward the world than be a king to his kingdom. Unlike the older son, the youngest son dreamed to become a king to this kingdom, he teached hard to learn the kingdom rules and tryied his everything to prove his father that he is better as a next king than his lazy older brother. Even thought the current king never payed any attention to his younger son.

To their 15th birthday was meaning to crown the next king as a accepted heir. Thought the older son began to shove against his father, saying that he wanted to be Pokemon trainer, raise, battle and challenge gyms and even leagues. The king was furious at his son, but his wife stopped this, saying that the king would not yet be old, a few years here or there does not mean anything. If his son really wants to see the world. Now, if ever, should be its time.
At next morning oldest son taked two his best pokemons with him and left the kingdom, toward the journal he was dreamed about.

5 years later the older son was been on his journal, raised, battled, challenged gyms, leagues, get lots of friends and even met his soulmate. He was living a peaceful life there, but his kingdom was slowly dying. 3 years since the mysterious illness had taken control of the town, killing people, Pokémon, destroying the harvest. Also, the queen had died and king was seriously ill.
Miraculously, the future wife of the olders son became pregnant. Knowing that this life would be dangerous for the future mother and the child, the older son decided to go back to his home kingdom.
only a week later the olders son's return the current king sleep away. The older son's task was to take his father's place as it was meant to be. The new king ceremony
chosen must ask permission to the legendary bird Ho-oh. Ho-oh agreed and made him the new king of the Kingdom. During the ceremony the new King wished to the Ho-oh to safe his kingdom to this mysterious illness. Legendary bird fulfills the wish, and the disease is gone. The Kingdom was returned to these peaceful days, but will it last?

Side spoiler!

During thoise 5 years after the older son left to his journal, his younger brother still wanted to prove his father. One day he found a black stone where there was an ominous aura after taking this stone the mysterious illness began. He has used the time to study the stone. When his older brother come back and taked his place as a king. The younger son became jealous and did the wish. "As a revenge to the former king as well as his older brother. That he would want only Kingdom... he wants control of the whole world". At that moment the black stone shined and answered to him "If that's your wish, I will give you a power to make that wish come to true". After that the youngest son disappeared.

Now 20 year is passed, the kingdom is been peacefully so far, but now anywhere toward the world have been mysterical attacks done by pokemons and trainer teams. The trainers call themself a Team Darkness and they obey their leader called Dark Lord.

The plot!

During the last 20 years many legandary pokemon are slowly disappeared, possessed or even hunted down (turned to a egg, waiting for hatching), even some important pokemon as Arceus is attacked. Thought when Arceus was weakened by battling, in his last action he separated his 18 plates and throwed them away, before get in a deep slumber. Same time part of his soul disappeared as well.

Currently the worlds balance is in danger, the weather is unstable and can be changed any time. Team Darkness, possessed pokemons and even legendaries which are not possessed make some caos as well.