The plot might involve Ash trying to prove himself to Alder. Alder could be seen as a sort of mentor figure that Ash wants to impress. Ash enters the battle with his team of Pokémon, each with their own strengths and weaknesses. Throughout the fanfiction, we could see Ash's Pokémon evolving and growing in strength as they face Alder's tough Pokémon. It could also include some emotional moments where Ash reflects on his journey so far.
In this fanfiction, the battle between Ash and Alder could be set in a special location, like an ancient Pokémon arena. The story could introduce new Pokémon species that are native to this area. Ash's Pikachu might be the key Pokémon in the battle, using its speed and electric attacks to counter Alder's Pokémon. There could also be some side characters who cheer for Ash or try to interfere in the battle for their own motives.
It's really hard to say. Ash has a lot of experience and his Pokémon have unique bonds with him. But Alder is also very powerful. If Ash uses his Pikachu cleverly and has some unexpected strategies up his sleeve, he could win. However, Alder's experience and knowledge of Pokémon battles also give him a good chance of victory.
One possible plot could be that Ash discovers a threat to the Pokémon world that only Arceus can stop. But Arceus is somehow corrupted or misinformed. So Ash has to fight Arceus to snap it out of it and save the world.
Well, it could be that Tobias has some evil plan to take over the Pokémon world and Ash stands up to him. Maybe Tobias has captured a bunch of rare and powerful Pokémon, and Ash, with his Pikachu and other friends, battles him to free those Pokémon and stop his tyranny.
In a fanfiction where Ash fights Tobias, Ash might win by using his bond with his Pokémon. He has a deep connection with his team which could give him an edge. For example, Pikachu might unleash a super - powerful Thunderbolt at a crucial moment.
The plot might start with Ash somehow obtaining Lugia for the battle against Tobias. Then, the battle could be a back - and - forth exchange of powerful moves. Ash would be trying to outwit Tobias, who may have some unexpected Pokémon up his sleeve. Maybe in the middle of the battle, Lugia gets injured and Ash has to come up with a new strategy on the fly to keep fighting.
One possible plot could be that Naruto is somehow transported to a different timeline where he has to fight the Hokage for a misunderstanding. Maybe there's a villain who has manipulated events to make the Hokage think Naruto is a threat. So Naruto has to fight not only to prove his innocence but also to save the village from the real danger that the villain poses.
Perhaps in this fanfiction, the court in the wizarding world has been corrupted. Harry discovers some dark secrets within the court system. He then decides to fight against it to bring justice. He might start by gathering evidence against those who are misusing their power in the court.
Well, perhaps Teddy is in some sort of danger. Maybe he's being targeted by dark wizards because of his connection to Harry. Harry, being the heroic type, decides to fight to protect Teddy. He could use his magic skills and the support of his friends like Hermione and Ron to keep Teddy safe.
In a 'naruto fights alone fanfiction', it could be that Naruto is on a mission in a foreign land where he has no support. The local ninjas are all against him for some reason. He has to use his Nine - Tails chakra in a more discreet way as he can't afford to go all - out and draw too much attention. He might befriend some local animals or spirits who help him in a more indirect way, like giving him information about the enemies' weaknesses.
Well, it could be that Percy is fighting Ares to protect his friends. Maybe Ares has threatened Percy's loved ones in Camp Half - Blood, so Percy has no choice but to face the god of war.