You Get it once you have Caught Reshiram/Zekrom And Beaten N. Then you will be back home and you will see Looker (Detective) But he is dressed a syour mom but he uncovers himself and he will give you it then asking you to capture the 6 remaining sages on the loose.
Hope That Helped! ;)
After beating the elite 4, you will be in your bedroom in Nuvema Town. Go downstairs, talk to Looker and he gives you the Super Rod.
In Pokemon Black and White, the Super Rod is the only Rod you can get.
You must beat the Elite Four. When the credits roll and you're at home go downstairs. You'll see Looker (the International Police dude from Sinnoh). He'll come to you and talk to you. He gives you the super rod. You cannot get the other rods in the game.
Sources: I play pokemon
I beat Pokemon Black on August 1st so my answer might not be totally correct.
After finishing the Main Story, Looker will give the Super Rod to you at your house.
The rod is not available until after the elite four.
When you get the master ball and national dex which is before you battle N. Prof junipers dad gives it to you.
Once you have a fishing pole in Pokemon go to a large body of water and cast the rod, after a little bit you will get a bite and a Pokemon battle will begin.
After finishing the main storyline, Looker gives you the Super Rod in your house.
you cant get the old rod in Pokemon black or Pokemon white
You get the fishing rod at your home after the elite four.
Dragonspiral Tower, use your fishing rod.
You can't. Luckily all unova pokemon can be caught without using a fishing rod.
You have to complete the whole game, then a guy named Looker will give you a Super Rod.
you ask a fishing man
You talk to fishermen and one gives you a fishing rod.
In Pokemon Black & White or any other Pokemon, you can catch water type Pokemon in the sea or by using a fishing rod.
After you finish the game for the first time, you'll get a Super Rod. As far as I know you can't get any other rod.
one of the fisherman on route 32 will give you a fishing rod.
go back to your house in nuvema town and talk to your mom
Use a fishing rod.
Old Rod---Route 32 from the Fishing Guru Good Rod---Olivine City from the Fishing Guru Super Rod---Route 12 from the Fishing Guru