Apparently someone that decided to flip their Pokemon for the fun of it. Maybe they were playing a game with it at the time.
The elemental stones at least make some sense, what with the elemental typings that Pokemon have.
The rest of it...I'm not sure I'll ever make sense of it. Pokemon are nothing like the animals we have back home; there's nothing that evolves and grows like they do? Even when you take quirks into consideration it's still taken years for significant growth and development of them. Pokemon don't seem to follow any natural logic like that.
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The elemental stones at least make some sense, what with the elemental typings that Pokemon have.
The rest of it...I'm not sure I'll ever make sense of it. Pokemon are nothing like the animals we have back home; there's nothing that evolves and grows like they do? Even when you take quirks into consideration it's still taken years for significant growth and development of them. Pokemon don't seem to follow any natural logic like that.