>>40119235watch videos. Observe what the players actually do in the situations.
read up on movesets/tactics. Find out what playstyle you want to do, and read up on what Pokemon threaten your team.
play more. You can start off by copypasting a team and once you play more people you'll start to observe the meta and pick rather unconventional mons, but that won't happen for a while.
that's really all there is to it. Research is the most important aspect of Pokemon PvP.
