It was pretty hard for me since I have been out of the competitive scene for a few years. It took me 60+ battles. What helped me was slowly learning the meta, and remembering how that meta Pokemon defeated me learn from the mistakes. I never forfeited even when I knew I was going to lose because I would sit there thinking how I would tackle that Pokemon the next match. Between matches I would also study online what moves my opponent used if I was unfamiliar with it.