How can I find tournaments with signups open when I just want to join some random tournament?
I would suggest picking whatever generation you want and copying whatever team you want from this. Use those teams until you've played a few battles and think you can build your own. The competitive tutoring room on Showdown! is pretty helpful when you have quick questions about battling.If I said I have very little understanding of the Gen 7 pokemon, would this change your answer?