You recently became a pokemon trainer in the kanto region, there's so many amazing places to go, so many pokemons to catch and you want them ALL! You decide to go where the journey takes you and you end up in the Unova region in a city called Nimbasa, while walking around the beautiful city. Your Pikachu runs into a snivy

Rosa: Oh! Sorry about that hehe! My Snivy can be a little clumsy... wait..! are you a new Pokémon trainer?! No way me too! And cute Pikachu you got!

she says excitedly