Alright so I got some unexpected free time, and I just did a quick test. Some GR info: Wario can be GR>uair guaranteed regardless of platform on all the neutrals in the EC rule set. So YI (depending on platform tilt), SV, BF, and Lylat. Wario can be GR>u-smash on BF regardless of platform. He can also be GR>u-smash under the side platforms on Lylat, but you actually need to time the u-smash or you'll either miss because you did it too quickly or get shielded because you did it too late. On YI, GR>usmash just depends on how tilted the center platform is. Also on SV, I lol'd because u-smash can't even reach the person on the moving platform.
On some CP's... GR>u-smash is guaranteed on the second transformation of Castle Siege, the second transformation of Halberd and I believe the standard transformation of PS1. Those were the only stages I tested in the short time I had. GR>uair is guaranteed on all these stages regardless of platform.
Some key notes:
When you GR>uair on some of these stages, do not dash, just jump straight away and uair, you will still get the strong hitbox if you do it properly. You may want to use the buffering uair described in this thread:
http://www.smashboards.com/showthread.php?p=11423761#post11423761
or you can learn how to claw like I did and just time uair right after jump.
Also the side platforms on Lylat, the 2nd transformation on CS and the 1st transformation on PS1 are the stages where you need to "time" your u-smash. You'll see what I mean when you try, but you can't buffer run>u-smash asap or you will completely whiff. Also, Lylat is still kind of annoying, because depending on where you grab him you may or may not air release him, because of the incline located on the sides of the stage.
Hope this helps, btw on a slightly off topic note, Sheik may be able to DACUS MK out of GR on the2nd transformation of Halberd and maybe,
maybe even BF. I know shield is frame 1, but when I perfectly buffered DACUS, it was very close and I could not tell whether he landed or not. The 2nd transformation of Halberd looks more hopeful than BF but I'll get somebody to hold the shield button next time I test, and check it out.
Edit: IF you are wondering how I tested this by myself, all I did was take two controllers hold the shield button for Wario with my pinky on my left hand then I held the other controller right above it. After a couple minutes, I got used to the awkward positioning so the results are reliable. The only reason I can't confirm GF>DACUS on MK, is because I can't properly perform the DACUS with my left hand in such an awkward position