I have a question for those having a problem with the Mysterious Rings doing anything at all, regardless of time. How far into the game are you? Have you already beaten the Elite 4 twice and finished up the Delta Episode? This is a problem that seems to come up on the GameFAQS forums too and I'm noticing that everyone who runs into it is in the post-game. I, myself, am in the post-game and noticing that the rings do nothing anymore. I'm wondering if it is a bug prompted by finishing up the game.