Ok, been trying to play X and Y spoiler-free up until now but I'm fucking beat. I've completed the 3 Kalos dexes, got the S. Kalos ticket off Sycamore and I'm at the part where the train stops.
How the fuck am I supposed to deal with the big fucking rock-thing on the train tracks? I've tried rock smash and it does nothing. Talking to it only makes it wiggle. I'm at wit's fucking end here.