How should I go about making a pokemon game?

This is way too broad for Help with Scripts. What specific coding problems are you having?

I haven't started the game. I am looking for advice on how to make the skeleton of the game, and use my own style to build the rest of it out.

Pokemon is in the more complicated area, so I don't recommend even tackling it if you are just experimenting around.
There are many Pokemon games of different “styles” and gameplay too. If you want to get to the older/pure 2D mainline games, I'd say work on a simple turn-based battle system, then the tile-based world generation, then do your own stuff from there.

Orrrrrr you can try something different like Magikarp Jump. (It's basically a pet care app lol…)

Return to this forum if you need help with making/debugging scripts!

As a basic start, have a look in this guide from the wiki: https://en.scratch-wiki.info/wiki/Turn-Based_RPG