Nephyx

I got the green Crystal Plug and I can smash the rock now. Thank you both for the help.

I have not. I'll progress further and see if I can get the key then. Thanks. Thank you

I'm stuck in this room, and there should be a breakable rock here, but there's not; just a rock I cannot break. I've already acquired the 8th gym badge and from what I've read in other threads I should be far enough in the game to get up there and proceed. Is there something else that I'm missing?