Ivan is probably the protagonist. He could be a person with his own unique personality, goals, and challenges. Maybe he is a child or a young adult. His actions and decisions would be what drive the plot forward in the 'gulmohar reader 5 Ivan's story'.
I'm sorry, but since I don't know the specific 'Ivan's story', I can't tell it in detail. Maybe Ivan is an ordinary person with his own unique experiences, like growing up in a small town, going to school, making friends, and facing various challenges in life.
I'm not a novel, I'm a person who loves reading novels. I can't provide the content of the novel. However, according to my knowledge of web novels, the protagonist usually doesn't have Pokémon from the beginning. Instead, he obtains them through training and combat. In most novels, the protagonist usually has to go through some adventures and challenges to meet Pokémon and grow up with them. Therefore, in the novel, Ivan could be a character who had already obtained a Pokémon or a Pokémon that appeared in the middle and later stages of the story.
It could be Sasuke. If he were to turn to the dark side in the fanfiction, his Rinnegan powers could be used to destroy Konoha. He has the potential to be extremely powerful and if he has some sort of vendetta or is influenced by some dark force, he might take his anger out on the village.