By the way, Dawson, Henderson, and Cato are what I think May's, Misty's, and Dawn's last names are. I can't guarantee those are canon, but they are all a headcanon to me.
14-year-old May Dawson wasn't happy about her move from Hoenn to Kanto. Her little brother, Max, was excited, though. He wanted to meet cute girls, because the ones in Hoenn always reject him. Well, May was a little excited, but only because she could meet her pen pal from last year. May's pen pal was a girl who lives in Kanto named Misty Henderson. They were the same age, and lived in similar situations. Sibling trouble, living in a Pokémon gym, and boys. Misty just understood. Even after the school pen pal project ended, they still kept in touch. May was transferring to the school of Kanto High School in Pallet Town. Misty was going there, too.
On moving day, May packed up very fast. She wanted to get this over with. Max was still very excited.
"May, I could get a girlfriend in Kanto!" Max said. May sighed.
"Oh, 12 year olds, thinking it's easy to ask someone out..." she muttered. After listening to Max rant on for an hour, the Dawsons left for their plane. When they got on, all of their friends said goodbye to them. They didn't have to worry about the gym, since it was being taken over by a new leader that Norman, May & Max's dad, chose.
On the plane, a blue haired girl her age asked, "Mind if I sit next to you?"
"That's fine with me. I'm May Dawson, who are you?" May asked, putting out her hand.
"I'm Dawn Cato. My family is moving to Pallet Town, Kanto." Dawn said, shaking May's hand.
"Oh my gosh, our family is, too!" May screamed.
"Where's your family?" Dawn asked.
"Oh, my brother is sitting near my parents. He doesn't like strangers thinking I'm related to him. 12-year-old brothers can be total pests sometimes." May explained.
"I have a huge family. There's my sister Tori, my stepsister Ashlyn, my brother Jared, and my stepbrother Jason." Dawn said.
"I'm sorry, I didn't know your parents were divorced!" May said, feeling sorry for Dawn.
"It's okay. I'm used to it now." May talked with he new friend, Dawn, for hours until they made it to Kanto.
"Oh, May, wouldn't it be cool if we lived near each other?" Dawn asked.
"Oh my god, it would! Maybe we could talk to our families about it!" May squealed. The two friends went off the plane, talking about what being neighbors would feel like. At the airport, May & Dawn ran into Misty, who was waiting for May.
I really don't know if Dawn has siblings, but oh whatever, it's an AU. Dawn's family is based on my best friend's, Abbie, family. She has a sister named Tori and a stepsister named Ashlyn. I know she has a brother (not sure if she has a stepbrother too), but I don't know their (his) name(s). Or age(s). By the way, Brock is in 11th grade in this AU. If he were 5 years older than Ash and the gang in this AU, he'd be out of college already! And I really need Brock in this fanfic. Plus he has a girlfriend at first, Giselle, from the episode The School of Hard Knocks. Also he's a new student, like May & Dawn. Brock dumps his girlfriend after meeting Misty and realizing he loved her.