According to Serebii I need black lvl 3, which I have.
To get the pass power to increase encounter level a little you have to get your entree to both black level 9 and white level 3. Then you can recieve the ppower from the entree. And you also need 2 pass orb to activate it.
I think you also need 2 pass orbs to buy the pass power.
Hope this helps