and if you did, Cordless guy would say that there is CRUSTLEs to the south of 8th gym and won't budge unless you use the official machine --- Pokemon Black Sapphire and White Ruby for Nintendo DS Announcement date: March 22 2013
Go to Seaside Cave (where the Roggenrolas were blocking you before), explore, then go to the Crustle. Use the Colress Machine and you will fight it. Afterwards go outside and the Frigate will be there for you.
Also to anyone who might yell at me for spoilers, this is a topic about what to do in the game. If you didn't want spoilers you shouldn't have entered the topic --- Official Lugia of the Pokemon BW2 Boards