>>38524136>demonstrably untrue, debatably with Youngsters and School kids, and definitely with the Preschooler classesIt's canon in the Pokéverse that 10 year olds are legal adults. Anyone before then is just a kid and they aren't those Pokémon's masters, they're just like borrowing them from mommy or daddy, maybe big brother or big sister. Once you turn 10 you can own one outright and go adventuring.
And yes, you can legally marry at 10 as well according the canon novelizations 