Game freak leak.
There was scrapped lore for some Pokémon found in the teraleak. One of the scrapped lore entries is Typhlosion grooming a girl and having a child with her.
I believe the rest of it goes: The typhlosion warns that if the father finds her, he would be forced to fight the girl’s father. When the father finds the typhlosion, he kills it. However, the girl then has to burn the eyes, heart, and something else of the typhlosion where the typhlosion was killed before returning to the village with the pelt. The story ends with the villagers bullying the family and the girl and eventually wrapping the girl in the typhlosion pelt, who then flees into the forest. I think the story wants us to assume she transforms into a typhlosion shortly after.