Perhaps there is a storyline where a trainer discovers an ancient artifact that is said to have a connection to Arceus. The trainer, out of curiosity, makes a wish using the artifact. This wish sets off a chain of events that takes the trainer into the heart of the Pokemon world's secrets. They encounter different Pokemon species that are rarely seen, and they have to face off against powerful foes who also want to control the power of the wish. In the end, the trainer has to decide what to do with the power of the wish and whether to use it for their own gain or for the greater good of the Pokemon world.
A storyline might involve a group of trainers who are all affected by a strange phenomenon in the Pokemon world. They come together and decide to make a collective wish to Arceus for a solution. Arceus could then give them a quest that requires them to cooperate and use their unique skills and the powers of their Pokemon. As they progress through the quest, they discover the root cause of the phenomenon and are able to resolve it, thanks to Arceus' guidance.
In a Pokemon Arceus Wish Fanfic, the plot could center around a character who is in desperate need of something. For example, a region might be facing a great danger like an evil team with powerful Pokemon. The protagonist then makes a wish to Arceus for the strength or the means to stop this threat. This could lead to an adventure where the character has to prove themselves worthy of the wish being granted. Arceus might set tasks or challenges for the character to complete before fulfilling the wish.
One possible plotline could be that the Lake Trio discovers a threat to the world that Arceus is either unaware of or is causing (unintentionally perhaps). So they have to battle Arceus to stop this threat. Another could be that a powerful villain manipulates the Lake Trio into believing that Arceus is a danger and they must fight it.
In the fanfic, it could be that Arceus has its own reasons for allowing Ash to catch it. Maybe it sees Ash as the key to restoring balance in a world that is slowly being corrupted by human greed and over - exploitation of Pokemon resources. So, as Ash catches Arceus, he is thrust into a mission to cleanse the world. He might have to travel to different regions and use Arceus's power to heal the damaged environments and reconcile the differences between humans and Pokemon.
Another storyline could be that a young trainer discovers a secret connection between Arceus and Giratina. This connection has been lost in time, and as the trainer uncovers it, they must convince Arceus and Giratina to work together again. It could be a story of redemption and the power of discovery.
Maybe there's a storyline where they have to face an enemy together as a married couple. This enemy could be a powerful Pokemon trainer or an evil organization that threatens their relationship and the Pokemon world. And they use their combined skills and the bond of their marriage to defeat the enemy.
One possible storyline could be that Alexa is researching a rare Pokemon in a region. Ash arrives in the same region on his journey. Their paths cross and they end up in a friendly competition to see who can find and catch the rare Pokemon first. Along the way, they have battles with other trainers and help each other out in tough situations.
One possible storyline could be that Pokémon have been mistreated by humans for so long that they finally decide to fight back. For example, they might start by sabotaging human - built Pokémon training facilities. Another could be that a group of Pokémon form an alliance to drive humans out of their natural habitats. They could use their unique abilities to make certain areas uninhabitable for humans.
One possible storyline could be that Saturn and Mars are on a secret mission to find a rare and powerful Pokemon that could change the balance of power in their organization. They face many challenges along the way, like rival teams trying to stop them.
Maybe Ash's old Pokémon have unique skills that are rare in Kalos. So, he uses them to gain an advantage in Pokémon contests or battles. His Charizard, for instance, could be a formidable opponent against Kalos's dragon - type Pokémon, and this could lead to some exciting rivalries and plot twists.
One possible storyline could be that Ash loses a really important Pokemon battle, like a championship match. This loss makes him question his skills as a trainer. He might start to isolate himself from his friends, like Pikachu and Brock. Another could be that a long - lost friend or Pokemon from his past suddenly reappears in a difficult situation, and Ash blames himself for not being there before. This could lead to his depression.