Giant Luma

[/imgres?imgurl=http://i316.photobucket.com/albums/mm322/FNintendo/FNintendo%25206/SuperMarioGalaxy2_06.jpg&imgrefurl=http://www.neogaf.com/forum/showthread.php%3Fp%3D20700810&usg=__BBm2menueNX0WZpm6XHxW61IUW4=&h=339&w=600&sz=169&hl=en&start=13&itbs=1&tbnid=Fj6KeQn17l167M:&tbnh=76&tbnw=135&prev=/images%3Fq%3Dmario%2Bgalaxy%2B2%2Bsupermassive%2Bgalaxy%26hl%3Den%26gbv%3D2%26tbs%3Disch:1 ] The Giant Luma is found in the Supermassive Galaxy

So far only one has appeared ever.

The first appearance of the Giant Luma is in Super Mario Galaxy 2.