[Ash493]

Originally Posted by manutdrule

darkrai is correct. sheer cold accuracy is dependent on the respective levels of both pkmn and would not hit at all if the opponent's level is higher.
(check bulbapedia)

I would still stick to the 30% rule =D
But that might explain why it does not work on higher levels...

Still, Toxic is the best choice.

Originally Posted by Conan Edogawa

I'm stuck on Mount Krystal and I don't know how I can progress.

Spoiler:

Angeallan's guardian trainer just left, but whenever I try to leave I get sucked into the conversation again. I tried talking to everyone who's left and nothing works. The only one to talk is Angeallan, but only says something about his counterpart then stops.

You need to battle Devihell