>>11820795http://www.youtube.com/watch?v=Zb4bz4kkNhM"Pika pika pi! Pi pika chu!" Pikachu specifically points you to where the noise came from, which happens to be a small snowfield just near the base of the mountain.
Speaking of which, because you're near the base, the snowstorm seems to have lightened up a bit, you can now see a tad more of your surroundings, but the storm isn't completely gone though.
Now, what kind of monstrosity could have made that deathly roar?
>Investigate where?A) The wall seems to hold mysterious imprints, go look at them.
B) The snow, you might just overlook some items.
C) The nearby burrow.