How do you get through a wall in pokemon diamond?

There is a wall in pokemon diamond that takes you to dailga in Mt. Cornet and after that you can get to sunnyshore cityHow do you get through a wall in pokemon diamond?
Take this AR code if you want to Walk Through Walls (Hold R)

b21c5a08 00000000



da000000 0000210c



d3000000 00000000



d7000000 023ffe18



d2000000 00000000



94000130 feff0000



923ffe18 ffef0010



b21c5a08 00000000



dc000000 0000210c



d9000000 00000000



d4000000 fffffff0



d6000000 00000000



d2000000 00000000How do you get through a wall in pokemon diamond?
You need Action Replay for DS:

http://us.codejunkies.com/Departments/DS-and-GBA.aspx

I'm guessing you saw a video on YouTube or something where a guy walked through a wall. It's a great product, I'm getting one for my b'day in 5 days. :D