Well, a great plot might be that Ash enters a special tournament where the grand prize is a chance to catch a Pseudo - Legendary Pokemon. He has to battle tough trainers along the way. Also, it could be that a Pseudo - Legendary Pokemon has some sort of unique ability that Ash discovers he needs to help solve a big problem in the Pokemon world. Maybe it can control a powerful energy source, and Ash must earn its trust to use that power for good.
I think Salamence would be quite challenging. It's a very powerful and aggressive Pokemon. Ash would need to have a really strong team to weaken it first. Also, its flying ability gives it an advantage in battle, making it hard for Ash to land a final blow for the catch.
There are also fanfictions where Ash catches Rayquaza. This could be set during a time when the sky is in chaos due to some dark energy. Rayquaza is drawn to Ash because of his pure heart and determination. Ash, with his usual courage, teams up with his pokemon to assist Rayquaza in restoring balance. As a result, Rayquaza allows Ash to catch it.
One idea could be Ash encountering a Legendary Pokemon that has lost its memory. Ash then tries to help it regain its memories while protecting it from poachers. Another could be a time - travel plot where Ash is sent back in time and has to team up with a Legendary Pokemon to prevent a great disaster from happening in the past that would change the future of the Pokemon world.
One interesting Pokemon pseudo - legendary fanfiction could be about a trainer's journey to catch all the pseudo - legendaries. They might face unique challenges like rival trainers specifically targeting these powerful Pokemon.
A third plot idea might be that Ash is the chosen one to bring peace between the different factions of legendary Pokemon. There could be some legendary Pokemon that are at odds with each other, and Ash, with his unique bond with Pokemon in general, is the only one who can bridge the gap. He would have to understand the reasons for their conflicts, which could be rooted in ancient history or disputes over territory. Along the way, he'd have to convince both sides that cooperation is better than conflict, and he might use his own experiences with his Pikachu and other Pokemon friends to show them how different species can get along.
In a fanfiction like this, the plot could revolve around the fact that the egg is the key to restoring balance in the Pokemon world. The legendary starter that hatches from it is initially weak but grows rapidly under Ash's care. However, there are forces at work that want to use the starter for their own evil gains. Ash has to team up with his friends and other Pokemon to fend off these threats. The story could also explore the relationship between Ash and the legendary starter as it grows, how they learn from each other, and how their bond becomes unbreakable.
I'm not sure specifically what this fanfiction is about as there could be many different interpretations. It might be about a character named Ash who has an encounter or relationship with a pseudo - legendary Pokémon in a fictional story created by a fan.
One common theme is Ash's self - less heroism. He often puts himself at risk to help the legendary pokemon in trouble. For example, when it comes to rescuing a legendary from a natural disaster or from villains.
I'm not sure specifically as there could be many different interpretations. It might be about Ash from the Pokémon world having a Pokémon that is considered a pseudo - legendary as his starter Pokémon. Maybe it details his adventures with this special starter in a unique and creative way that diverges from the normal Pokémon storylines.
One possible plot could be Ash being chosen by Arceus to save the world from a new, mysterious threat that even the Legendary Pokemon are powerless against. He has to travel to different regions and form bonds with various Legendary Pokemon along the way, using their combined powers to face the danger.