The Finite Path

In a Pokemon world where the main conflicts never occurred, in which the hardest obstacles the heroes had to overcome were the champions; relative peace lasted for decades. However, Arceus one day foresaw great change and wished to prevent the world's destruction. Yet they are unable to due to being bound in a conflict spanning eons with a great foe. Tasking the 3 legendaries to help, they sent a system down to the planet in the hopes it would help prevent the grim future.
[Challenge System Operational]
"Huh?"
[Rival Is Needed For Growth]
[Creating Rival]
"WHAT!?"
-I don't own Pokémon or any of the images, I only own the OCs-