What is in the blocked off cave in Victory Road?

Question

In Pokemon Black there is a sub-cave blocked off by a small rock. Can't move it with strength.

What is in there and how do you get in?

Answer 1

You get in by capturing/defeating Cobalion in the depths of Mistralton Cave. After you do, the "seals" on the Trial Chamber (the blocked cave in Victory Road, home of Terrakion) and Rumination Field (Virizion's home inside Pinwheel Forest) will be removed, allowing access.

Comments

I'm sure that only needed is Cobalion

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I never said both were needed.  I said both could be accessed after Cobalion...