MSP threads are a daily challenge where anons on /vp/ draw, no matter the amount of skill or time on their hands, a Pokemon that gets selected daily. Just let yourself go, it doesn't matter if you draw a stick figure resembling this day's Pokemon or draw something that would rival Michelangelo's works, everything will get accepted as long as it complies with this board's rules.
To know better the feel of these threads, you can look for the old MSP threads: https://archive.nyafuu.org/vp/search/subject/MS%20Paint%20Topic%20Day/

>Day 4: Sableye & Mega Sableye
>Hard Mode: No References or Fixes

You know the drill. A Pokemon (or a Pokemon line) is selected from a list daily, you get in this topic, you draw a Sableye in MS Paint (or similar program), and post results. Unlike the traditional MSP threads, the list is public and Pokemon does not get selected at random.

List of Pokemon: https://archive.nyafuu.org/vp/thread/40110245/#40115727
Yesterday: >>40212448