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What we know about Leon in the anime
>His only friend when he was a kid was Sonia. He was too busy helping out around the house and taking care of Hop to spend time with other kids
>Meeting Charmander introduced him to the world of Pokémon battling, which expanded his world. By traveling and battling he finally got to meet all sorts of people, friends, rivals, foes, etc.
>Rose saw potential in him and decided to use him as a pawn in his master plan. Rose arranged battles against one strong trainer after another, making sure Leon became the strongest trainer in Galar and, eventually, the whole world. As the mightiest trainer, he'd be able to catch and control the mightiest Pokémon, Eternatus.
>Leon's reputation as a perfect champion and a hero is just a facade. Deep inside he's just a child having fun.
>Tends to get lost all the time, but it doesn't matter, wherever he goes he's happy because it's a chance to meet pokémon and people, and a chance to get stronger as well by overcoming any challenge that may arise
>Doesn't care about being the strongest, in fact he hates it because it makes him feel like he's reached the top and can't keep moving forward. He wants to keep improving every day and for that he wants to keep meeting people and pokémon who surpass his power, like Eternatus.
Why do people hate him again? he's a nice guy