Just won my battle with Suicune guardian and got no reward, just the message posted below. Never seen the message before so am not sure if it's new or a troll. Also didn't get to pick whether I wanted easy, medium or hard battle, am unsure if that was implemented with the revamp but assume it was meant to be.

I think I caught the error.

All guardians have only one difficulty. I can reset the cooldown for you if you would like.

Yes please, that'd be great if you can.

Talk to Lass Janine in Ecruteak Pokecenter. This should reset your cooldown. Let me know when you do, please.

Thanks dude, I've spoken to her

Alright - sorry for the inconvenience, let me know if anything else is wrong.

Just gone back to Suicune guardian, it didn't reset the cooldown

Alright, one second

I don't see a Suicune boss cooldown set for you on either Gold or Silver, can you double check to make sure?

E: Nevermind, see it now

Cooldown is still there for me. Closed the game completely and restarted just in case and still have cooldown after that.