I think Lucario would be an interesting addition. It's a very intelligent and powerful Pokemon. It could sense danger and help Ash make better decisions. Also, Squirtle is a fan favorite. Its cute appearance and water - type abilities can add a lot of fun to the story, especially in water - related adventures.
Mudkip could be included. It's a very determined Pokemon and its ground - type moves can be useful in many situations. Glaceon would also be good. With its ice - type powers, it can create beautiful and useful ice structures. And of course, Greninja, which has a strong bond with Ash and its ninja - like abilities can make for some exciting battle scenes.
Pikachu is a must - include. It's Ash's most iconic Pokemon. For Sawyer, his Slurpuff could be great. Also, Greninja for Ash would add a lot of action scenes. Sawyer's Sceptile could also be interesting to include as it can show the different training styles between them.
Gary Oak could be an interesting addition. His rivalry with Ash is well - known, and his skills as a Pokemon trainer would make him a valuable character. Then there's Blue, who has a connection to Red. His different approach to Pokemon training compared to Ash and Red could create some interesting storylines. And don't forget about Professor Oak. He could provide guidance and knowledge to both Ash and Red, and his presence always adds a sense of wisdom to the Pokemon world.
Professor Oak would be an excellent addition. He could provide valuable advice to Ash and Lyra, maybe even send them on a special mission. Also, Dawn could be included. She could be a friend who joins them on their adventure for a while, bringing her own unique Pokemon and skills to the story.
Well, in a spiderman pokemon fanfic, Venom could be an interesting character to include. But instead of the traditional Venom, it could be a Venom - like Pokemon. And Spider - Man has to deal with this new threat. Also, Eevee could be in the story. Eevee has the potential to evolve into many different forms, and it could be a sidekick for Spider - Man. It could evolve in different ways depending on the challenges they face in the story, adding an element of growth and change.
Brock is also a good option. His knowledge of Pokemon and their care could be useful in the fanfiction. He could help Pikachu when it gets sick or injured, using his skills as a Pokemon breeder.
Pikachu is a must - include. It's Ash's most iconic Pokemon and always adds a lot of charm and power to the story. Brock could also be great as he has a lot of knowledge about Pokemon and can offer valuable advice.
Sylveon is a very charming Pokemon. In a harem scenario, it could be the Pokemon that brings harmony to the group with its fairy - type nature. And then there's Lucario. It's strong, intelligent, and has a sense of honor. It could play the role of the protector in the harem, making sure all the other Pokemon are safe while also having a special bond with the trainer.
Brock would be an excellent character to include. He has been with Ash and Misty for a long time and his knowledge of Pokemon and their care adds a lot to the story. Also, Pikachu is a must - have. Pikachu is Ash's closest companion and its cute and powerful nature always makes for great interactions. Another good character could be Tracey. He can bring in his drawing skills and his unique perspective on Pokemon. His addition can create some interesting storylines, like him trying to draw a new and rare Pokemon that Ash and Misty encounter.
Pikachu is a must - include character. Since Pikachu has been with Ash from the start, it would add a sense of familiarity and also provide great comedic moments and powerful battle assistance. Brock could also be a good addition. His knowledge of Pokemon care and breeding could be useful in the story.
Definitely Team Rocket. Their constant attempts to steal Pokemon would create a lot of action and comedic moments. Nurse Joy is also important as she can heal their Pokemon when they are injured. Officer Jenny can be there to enforce the law when Team Rocket causes trouble. And Cilan from the Unova region. His expertise in Pokemon types and flavors could add a unique aspect to the story.