His name is Darmanitan and you can awake him with a RageCandyBar given by Professor Juniper during the story
In the main storyline in Pokemon black King N's castle appears after you beat the last member of the elite four.
Volcarona is inside Relic Castle.
N's Castle, dragonspiral tower
yes and go to the Pokemon centre near the Pokemon league talk to the team plasma guy and he will take you to ns castle
In N's Castle where Zoroark went
You can use the RageCandyBar in the Desert Resortto awaken Darmanitan in Pokemon Black and White.
ns castle
In the main storyline in Pokemon black King N's castle appears after you beat the last member of the elite four.
relic castle
only in pokemon black. (n's castle)
It can be found in the Relic Castle in Pokemon Black Or White
Relic Castle in the desert
After the elite four you will find him in the castle.
n's castle after the elite four
you have to get to the bottom
Volcarona is inside Relic Castle.
N's Castle, dragonspiral tower