Player versus Player. This will challenge players' understanding of their Pets in order to be victorious and win many rewards.
These Victories will increase players' ranking on the leaderboard. Each player will be rewarded prizes appropriate to their rankings.
Again, in order to win, you have to get familiar with the RPG system, explore it, and master it. Understand your pet's strengths and weaknesses. Understand what formations work best and how to mix a strong team.