When information is free on the internet, ignorance is no excuse for anything. If you're too lazy to look for it yourself, this is what formats (not necessarily tiers) have to do with Pokemon. We ask for formats because, if you were allowed to do anything, we would suggest replacing every member of your team with Rayquaza. However, a lot of people don't like to have their outcomes rely on winning speed ties, so they often create formats that ban Rayquaza and a few other Pokemon and moves. We just want to know what we are allowed to suggest.