The theme of cooperation is quite prevalent. They are two very different characters, but in fanfics, they come together to solve problems. For example, Burnet might use her scientific expertise to help Ash in a difficult Pokémon battle situation, and Ash could use his battle experience to assist Burnet in her research fieldwork. This cooperation makes for really engaging storylines in the fanfics.
One common theme is friendship. Since Ash is always making friends, and his relationship with Burnet can be seen as a unique friendship where they learn from each other. Another theme is discovery. They often go on adventures together in the fanfics and discover new Pokémon species or new aspects of Pokémon behavior.
One common theme is adventure. Since they are both associated with Pokémon, many fanfictions have them going on various adventures, like exploring new regions or uncovering secrets.
One great Ash and Professor Burnet fanfic is 'Adventures Together'. It shows their unique relationship as they explore new Pokémon regions. The story has a lot of heart and some really interesting character interactions.
The theme of competition is often seen. There are other junior professors or even senior ones who might see Ash as a threat or a rival. He has to compete for research grants, for the best students, and for recognition within the institution. Also, the exploration of different academic fields is a theme. Ash might start in one area but then get drawn into other related or even completely different fields, which broadens his perspective and the scope of the story.
One common theme is friendship. Ash and Professor Kukui often form a strong bond in these fanfictions. Another theme is adventure. They usually go on some sort of Pokémon - related adventure together.
One common theme is Potter's leadership. In many fanfics, he uses his experiences to lead the students or the faculty in new directions. Another theme is friendship. Potter often forms new friendships or deepens old ones in these stories.
One common theme is the professor's backstory. Writers often explore what made the professor who they are.
One common theme is knowledge and discovery. Since he is a professor, many fanfics revolve around his search for new knowledge or his sharing of knowledge with others.
In a lot of 'Professor Flitwick and Harry fanfic', the theme of self - discovery for Harry is present. Flitwick, through his wisdom and magical expertise, helps Harry understand more about himself and his potential. It could be about his magical abilities, his place in the wizarding world, or his personal values. This exploration often leads to Harry growing as a character and becoming more confident in his abilities.
One common theme is their relationship. Many fanfictions explore how they fell in love and their married life. Another theme could be their roles in the Pokemon world, like Kukui's research and Burnet's work, and how they interact with other characters in that context.
I'm not sure if there is specific 'professor burnet pregnant fanfiction' available. Fanfiction can vary greatly in availability depending on the popularity of the source material and the creativity of the fan community. You could try searching on major fanfiction websites to see if such works exist.