One possible plot could be that Ash and May are exploring a new region. They come across a forest where they notice Plusle and Minun playing. They decide to try and catch them. Ash uses Pikachu to try and weaken Plusle while May uses her Skitty to do the same to Minun. After a bit of a chase and some battles, they manage to catch them. Then they discover that Plusle and Minun have a special ability that can help them in their future adventures.
Their relationship with other Pokémon would likely change quite a bit. For Ash, his other Pokémon like Charizard might initially be a bit aloof towards Plusle and Minun. But as they see how useful Plusle and Minun can be in battles and how they contribute to the team spirit, they would warm up to them. For May, her Pokémon like Eevee could start to develop new strategies in battles with the addition of Plusle and Minun. Plusle and Minun's presence could also encourage Ash and May's other Pokémon to be more social, as they are very social Pokémon themselves. This could lead to more group activities among all of Ash and May's Pokémon, like playing games together or exploring new areas as a united group.
Ash's boldness would likely contrast with May's more refined approach. Plusle and Minun's playfulness would add a light - hearted touch. Ash might get Plusle and Minun into some wild adventures, while May would try to keep them in line when it comes to her contest - related activities. Plusle and Minun could bring out the fun - loving side of both Ash and May. For example, they might convince Ash to take a break from his intense training and have a little fun, and they could also make May see the value in just enjoying the moment with Pokémon outside of contests.
One possible plot could be that Ash and May are on a journey through a forest. They encounter Plusle and Minun who are in trouble because a group of wild Pokémon are chasing them. Ash and May decide to help. They battle the wild Pokémon together, with Plusle and Minun using their electric moves to assist Ash's Pokémon and May's Pokémon. Afterward, Plusle and Minun become friends with Ash and May and join them on their journey for a while, leading to various adventures like exploring ancient ruins and solving mysteries in the Pokémon world.
For Ash, his already existing determination can be further emphasized when it comes to protecting Plusle and Minun. He could show more patience in teaching them new things. May could become more confident in her decision - making. Maybe she takes the lead in some situations involving Plusle and Minun. For Plusle and Minun, their playfulness can be a starting point. As the story progresses, Plusle could become more cautious while Minun could grow to be bolder.
One idea could be that Ash and May find a pair of Plusle and Minun that are lost. They then embark on a journey to reunite them with their family. Along the way, they face challenges like wild Pokémon attacks and difficult terrains.
One possible fanfiction could be about Ash's adventures in Hoenn during the month of May. Maybe he discovers a new Pokémon species that is only active during this time of the year. He could be traveling with his usual companions and facing challenges specific to the Hoenn region.
It could be a rival trainer. Rival trainers are often very competitive in the Pokémon world. Maybe this rival is jealous of Ash and May's progress and decides to betray them to slow them down. They might spread false rumors about Ash and May, causing other trainers to be distrustful of them.
Often, these fanfictions will take the characters out of their normal settings. For example, they might end up in a different time period or a strange new land. This allows for a lot of creativity in the storylines. And the character development of May and Ash is usually a big part of it, showing how they grow and change throughout the story.
Yes, there might be. Fanfiction covers a wide range of scenarios and relationships, so it's possible that someone has written a story where May cheats on Ash. You can try searching on popular fanfiction websites.