Homeostasis isn't a good word to use in a dex entry, imo. Think about the audience playing this game, it's going to potentially be a lot of 11-15 year olds who aren't going to have any idea what that means.

I think we're on the right track now though. Let me take a stab at it:

Deeply disturbed by conflict, KURANPU appears at times of great imbalance. Its devotion to harmony is the reason for its title as the mediator of all disputes.
I think 'at times' is better than 'in times', regarding the context of the sentence. And yeah, harmony over homeostasis.