How are games screened for cheating if there is no report button in-game.

When an Azumaril can tank multiple Pokemon with seemingly no problem. A Clefairy can infinitely spam heals. I think it’s obvious they’re cheating. Pokemon who have 4 to 5 seconds cooldowns and I’m supposed to believe they achieved 300% cooldowns at level 5 or are level 9 when everyone is 1 min into the match and the match is barely going to spawn in grouped wild Pokemon mid jungle. How do we report that?