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The first hour of the game is filled with the main characters telling you how dangerous the world is and that they're basically throwing you to the wolves if you can't catch 3 pokemon.
You would literally be exiled from the village TO DIE. It is explicitly stated that you're basically gonna be a snack for ursaluna if you fail your trial.
Pokemon are dangerous in this world. You think that gamefreak would make a game where the story is that if you fail, you, a CHILD, a literal 10 year old child would be exiled to the forest full of horrific abominations of nature only seen in the realm of fever dreams waiting to feast on your flesh?
Being 15 just makes more sense given the responsibility and weight of your actions early on.
>implying you at 10 years old wouldn't be a tasty treat for ursaring within a day of being cast out on your own with no food or resources