You're just in luck. I'm sitting here bored and looking for a reason to post here, so I'll give reviewing your story a shot.
One of the first things that I noticed is that you need some help with grammar, especially when it comes to punctuating dialogue. You don't punctuate your dialogue at all here when you should. Dialogue is really just the same as normal sentences, so it still needs the proper full stops, commas, question marks, exclamation marks in it.
I mustered up all my courage to ask a question I always meant to, “Mom” This was my only chance “Can I go on a Pokemon journey”
Like here, it should be:
I mustered up all my courage to ask a question I always meant to. “Mom.” This was my only chance. “Can I go on a Pokemon journey?”
You say that you posted this in a rush, which isn't something you should do. Take your time writing. Use a word processing program so you can save your work to the computer and write when you have the time. When you finish your chapter, take a few days to edit it over, reading it through for mistakes and adding/removing any parts necessary. This way, readers get your best work, and potential reviewers will know where you need improvement and what you're good at. Otherwise, it's like you didn't really try.
I will say that the chapter is fast-paced. A little too fast-paced. The main character doesn't even have a name. The family situation is just passed over with no explanation as to why the family doesn't like Pokemon or why the main character does (and why they're unfamiliar with the basics of Pokemon training). Then there's the capture of Dusk. It just seems so convenient that a Duskull (not native to Sinnoh) is around in the city and doesn't need to be battled before being caught. It kind of cheapens the scene because it's not a challenge for the main character. They just simply get their first Pokemon, which should be a special scene for a character who's waited for this to happen for a while, and move on without any difficulties.
Speaking of moving on, you say that the main character was wandering around Jubilife when it was dusk but arrived at Sandgem by noon. So either they walked all night, or you skipped over a scene that could have developed both the main character and Dusk by having them work through their first night together on the road.
I'm not going to do a full review because I'd like to see how you would rewrite the chapter without a lot of advice. Like I said, if you do that, then we'd know where you stand in your skills as a writer, and we'd know what to point out in terms of what you did well and where you need some improvement.
So yeah. If you feel the need to rewrite, do so and post, and I'll review that because it'll be your work not posted in a rush.