Unreachable TM

[Lucifer Morningstar]

'Sup? You're friendly neighborhood devil is back with a minor inquiry.

 

I've searched all around Reborn City but can't figure out how to reach this TM:

How do I reach it? Hopefully it's a good one. 

[Edo]

Go to the railnet entrance in Peridot ward, when under the bridge surf to the right to get out again.

[Lucifer Morningstar]

Thanx. I didn't realize you could go under the street in the Obsidia Ward.