Credibility is a system that has been implemented to reward sportsmanlike players and to prevent players from leaving games and abandoning their teammates. There are three ranks of Credibility: green, yellow, and red.
Green: If your Credibility is green, you will be prioritized above players with yellow or red Credibility when match-making, meaning you can play new matches faster.
Yellow: If your Credibility is yellow, you will not be prioritized when match-making, and you will receive a 30% penalty to your battle rewards.
Red: If your Credibility is red, you will be placed at the back of the queue for match-making, meaning it will take longer for you to join new games. You will also receive a 50% penalty to your battle rewards.