Game of Destiny

The Game of Destiny is a main plot element in Mega Man ZX Advent, although it was briefly alluded to in Aile's story in the previous game, Mega Man ZX.

Mega Man ZX Advent
The Game of Destiny was made by Master Albert to determine who is the strongest Mega Man, ordering Pandora and Prometheus to Biomatch his Chosen Ones to a Biometal, and making them fight against each other until only one of them was left, promising that the winner of his contest would receive the power of Model W and become the king of the world, the ultimate Mega Man, allowing the user to change the world with its power.

However, Master Albert was only using the Mega Men, as he planned to become the Mega Man King since the beginning. When Ashe/Grey confront Aeolus, Thetis, Atlas and Siarnaq inside Ouroboros, and say Albert was using them, Aeolus says this is only a trifling technicality (since the rules are still valid, and the winner out of all of them only had to defeat Albert to become the king). The Game of Destiny ended without a winner, as Albert had died and Model W was apparently destroyed.