Core issue:

-Issue title: flickering stripes while battling in stages.
-PCSX2 version: latest stable version (1.2.1) & Development build (v1.3.1-58-g5ed3f5f)
-PCSX2 options: Defaults, no settings modifications affect the issue.
-Plugins used: GSdx & ZeroGS , SPU2-X, Lilypad, Linuz ISO/Gigaherz CDVD,rest null plugins
-Plugin settings: Defaults, no settings modifications affect the issue

-Description: buggy landscape/ground with flashing flikering stripes and polygons especially when flying, varies in intensity from stage to stage, more noticeable when the player is present in higher altitudes, This is more likely to be a core issue since, The Issue was also present in ZeroGS.

-How to replicate: Start a duel with namek as the fighting location. (it's more noticeable on the specific location) then, Take a look at the ground and the green water of the location it will usually be filled with flickering black stripes.

-Last known version to work: Never worked.

[References]
GIF: https://gfycat.com/AdorableInsistentGoa
Video: https://www.youtube.com/watch?v=0vr7rXBEI8A&hd=1 (At 0:12 you can see the Issue. And at 0:29 it's even more apparent.)
GS dump: http://lastfencer.net/gsdx_20150511204417.gs