Pokémon trainer x reader

Allister x child!reader-(pinky promise)

(Both are you are kids.)
(g/n) = guardian

You are a kid in grade school in the town Stow-on-Side.  You were playing outside around until you ended up near the ghost gym.  You heard that a fellow grade schooler was the gym leader.
"I wonder what the kid is like?" You wonder looking at the entrance.  As you wonder looking around you see a shadow quickly running into the woods.  You follow after the shadow and run into the woods.  Even though your mom told you not to but your curiosity got the better of you.  But after a bit you lost the shadow and got lost in the woods.
"Oh no, where am I?"  You ask looking around.  You tried to retrace your step but couldn't find a way out.  After what seems like an hour you started to cry.  You heard crackling and see Impidimp.  You start running from it and it starts chasing after you.
"Someone help me!" You scream as you run.  You kept running and hope the pokemon got bored and stop chasing after you but to no avail.  After a while you trip over a branch and more of the same pokemon surrounded you.  "S-someone help m-me."
"Mm gengar use shadow ball."  A voice say.  A gengar appear and shadow ball attack one of the Impidimp.  All the Impidimp look at the fainted one of them and ran off in different directions.  You look to see the trainer to see a kid around your age with gym uniforms and a mask on his face.  The boy holds out his hand and ask, "Mm you oh-k?"
"Y-yes I am.  You're the gym leader aren't you?"  You asked taking his hand.  The boy nods and starts leading you through the woods.  Different ghost pokemon appear around him.  "Ah your really good friends with pokemon right?"
"Mm yes dead and alive ghost pokemon."  The boy said.  A gastly comes up to him and starts talking to him.  He then turns around, "He said he is sorry he brought you here he didn't mean to."  The gastly comes up to you and gives a sad look.
"Don't worry its find its mine fault for following you."  You look at the boy and back a the gastly. "Hey what's your name and can we be friends?"  The boy stops in his tracks and looks back at you.
"Y-you want to be my friend?" He asked.  You nodded your head.  "I guess we can.  'M Allister."  You run up and hug him and both of you fall, which causes his mask to fall off.  You didn't notice it yet you were just really excited.
"Heh Allister my friend now.  Oh my names is (Y/N)"  He push you off and stats looking around.  You gave a confused look then you notice that his mask was off his face.  "Oh no that's bad, I'll help you look for it."  You start looking around for his mask.  YOu end up finding it by a tree.  You handed to him and puts it back on his face.  "Sorry for knocking it off.  Hope you can forgive me."  He just takes your hand and bring you the entrance.  "Thank you for bringing me back out!"  You run off a bit ahead of him then run back to him.
"Mm its find.  Can you not tell people that you saw my face?"  He says fidgeting around.
"No problem, in fact I will make a promise," You say as he gives you a confused look, "Sense I saw your face why don't we get married when we get older."
"W-what?!"
"Yeah come on it's a promise. " You hold out your pinky for the promise exchange.  He puts out his pinky and promises.
"It's a promise and," he takes out a pokeball and hands it to you, "the gastly wants you to be his trainer so my give to my future w-wife."  You take the pokeball and look gastly.  The gastly taps its head on the pokeball and enters it and you hear it click.
"Wow thank you Allister, my first pokemon!" You hug him again carefully this time so his mask won't fall off.  "I have to get going home but hope to see you tomorrow?"
"Mm I have match tomorrow but you can come watch, its at noon.  I'll save you a ticket."
"Awesome see you tomorrow then!"  You yell as you wave him goodbye. He waved back as well.  You run back home to tell your mom the news.
Extra:
    When you got home your (g/n) ran up to you and starts yelling at you, "Where have you been?"
    "I was with friend Allister and we're going to get married in the future." You say happily.
    "What?!" Your (g/n) screams.
    "Yeah he even gave me a pokemon as a gift to his future wife!"  You say as you bring out gastly.  Your (g/n) gave a concerned look for what they just heard.

Allister one of my favorite bois!! I hope you all enjoy.
Until next time
-Kid