In Pokémon White 2, in order to get the Crustle in the Seaside Cave that is blocking your way to the Plasma Frigate to move out of the way is to find Colress in Route 22. Once you are at Route 22, you will see both Colress and Terrakion however you will not be required to battle Terrakion at the present time. Once you interact with Colress, he will give you his Colress MCHN which will allow you to move the Crustle that is blocking your way in the Seaside Cave.
The Seaside Cave only exists in the Pokémon Black 2 and White 2 games, not in Pokémon X and Y. It basically connects Undella Bay to Route 21.
There are about 5 Rock-types in the Unova Dex. Roggenrola, which can be found in Wellspring cave. Boldore, which can be found in Chargestone Cave, Mistralton Cave, Twist Mountain, Challenger's Cave, Giant Chasm, or Victory Road. Gigalith, whom you receive by trading Boldore. Dwebble, on Route 18 or Desert Resort. And lastly, Crustle, found only on Route 18.
after u defeat Marlon u go to terrikion located at the entrance of the giant chasm.after u defeat/capture terrikion colress will give u the colress machine. then go 2 seaside cave located south of humilau city.With the colress machine u will be able 2 move the wild crustle (level 43). then u will board the team plasma frigate with your rival.
no
He is in a cave!
No there is not.
In Pokémon Black 2 and Pokémon White 2, the Wild Pokémon that can be found within the Seaside Cave would include Psyduck, Golduck, Seel, Dewgong, Woobat, Frillish, Boldore, Tynamo and Jellicent. Frillish and Seel can be found while Surfing. Seel, Jellicent and Dewgong can be found in the surfacing fish while Surfing. Additionally Excadrill can be found in the Dust clouds.
You get it at Mistralton Cave
helo
Outside the Chargestone Cave.
you are in the Pokemon legue then go out go in the cave and go to the left stairs in the cave then you find your way.
mistralton cave