Welcome! I hope you enjoy your stay here at the forums!
If you ever need somepony to talk to, I'm free.
I'm a beginner at digital art, so maybe we can discuss about art tips and such.
I suggest using PaintTool SAI. It is waaaay better for graphic drawings, especially if you're using a Wacom!
Your drawing however looks good for it being done on MS Paint.
I would pick Treecko, because he was my favorite from the original gen three starter. Plus it could learn aerial ace which countered the self righteous Blaziken.
Welcome to the forums! I can totally relate to you about neglecting season 4. I've only watched a few episodes and I really need to catch up on it. Anyways, enjoy your stay at the forums!