The main characters are Peter and Maxie, of course. Peter might be depicted as a brave and adventurous type, always ready to take on new challenges. Maxie could be portrayed as intelligent and resourceful, often coming up with clever solutions to problems they face together.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, and there's a good chance you'll find Maxie and Peter fanfiction there.
There might be a fanfiction where Maxie and Peter are in a school setting. They could be working on a project together and gradually develop a deeper friendship or even a romantic relationship through the process. This type of story often involves the challenges they face in school and how they support each other.
One popular theme could be their friendship development. They might start as strangers or acquaintances and gradually form a deep bond through various shared experiences. Another theme could be adventure. Maybe they embark on a journey together, facing challenges and relying on each other's strengths to overcome difficulties. Also, a theme of self - discovery can be present. As they interact, they learn more about themselves.
One possible fanfiction could be about Maxie's childhood discovery of his love for geology. Maybe as a child, he was constantly exploring caves near his hometown, collecting unique rocks. This early interest led him to study more about the earth and eventually formed his extreme views in the Pokemon world regarding land expansion.
I really like the fanfiction 'Maxie's Redemption'. In this story, Maxie realizes the error of his ways after the events with Team Magma. It's a great character study of Maxie and how he tries to make amends in a world full of Pokemon.
Maxie could be shown as a curious child, always asking questions about the power of Pokemon. His inquisitive nature might have led him to start his own little 'research' group with other kids, where they would discuss and debate about different Pokemon types. This early group could be seen as the precursor to Team Magma.
One possible fanfiction could be that Levi and Maxie are on an adventure in the Pokemon world. They come across an ancient Aztec necklace that has some mysterious power. Maybe the necklace can control certain types of Pokemon or has the ability to unlock a hidden area filled with rare Pokemon. Levi, being the more cautious one, wants to study the necklace further before using it, while Maxie is eager to test its powers immediately.
One common theme is loyalty. They are often depicted as being loyal to each other or to their cause. Another is adventure. They go on various quests and journeys in the pokemon world.