You're walking around town, nothing unusual. You go to the Pokémart and buy 99x Pokéballs, of course getting 9 premier balls as a bonus, and run out into the forest nearby. You get into the deeper parts of the woods and see a girl, that girl is Rosa, she seems not to notice you yet, because she's focused on trying to catch a pidove

Rosa: Come on...come here, little guy...

she readies a pokéball in her hand