Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
If a player report system would be too complexe, reducing the amount of time allowed between plays and after disconnection would solve a cheating issue : too many players (almost half of those I fight) just disconnect before loosing or just stop playing and wait until the time runs off, hoping...