Skygrid was created by a PC Minecraft player borrowing ideas from "skyblock". It's not a map so much as it is an editor that generates the blocks in grid form instead of land masses. Your best bet is to either find a xbox saved world of someone's copy of skygrid online and download it to a flash drive to put on your xbox or get some friends to build a mini replica of skygrid as random as you can make it then all of you play there. Then you can reset the world or make 2 versions of it for the cloud and your hard drive as a new fresh skygrid.
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Just because your online doesn't mean you should act with no disregard for the real people through the screen.