Edit 3 for more usefull post! Edit 4 Fixed a few links!
Just tried it, works for me, I am using it on a Wii U. The first time I went into the stage builder, it just sat there. What I did then was to format the card, Re add all the files from the PMPE 3.0.2-10 folder straight into the sd card, and just for fun deleted Changelog -10, Readme and Troubleshooting, and Songs Replaced -10 from the files. (all the text documents besides gameconfig)
After that, its worked without a hiccup, make sure that your card is not higher than 2gb, as it can cause problems
Edit: My biggest issue for suggesting new content is I don't really know where to look for it at xD, I don't really want to just be like I WANT A LUIGI COSTUME FOR PEACH (which I do btw, I know that texture exists at least!) without knowing what the limit is on to what we can have... But thats mainly because Im not very knowledgeable when it comes to what can and can not be on here.
although I'm interested now and am going to scour the brawl vault!
Edit 2: Big one!
After looking through the vault for 4 and a half hours and looking over the stages and skins in the game... I have found some things to suggest! sorry if this is too much! I shouldn't have listed any which are already in the pack since I triple checked, Sorry if i did!
Again, sorry if some of these can not be used, as I am not savvy to brawl hacking. I did avoid moveset changing ones at the very least!
Marth:
Steve from minecraft
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=204113
Asuna from sword art online
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=36039
Zero Suit Samus:
Kit
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=23394
Peach:
Luigi costume! i knew it existed
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=26307
Captain Falcon:
Dry bones Falcon!!
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=35526
Ganandorf:
Metang from pokemon (does this even work? it has no legs!!!)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=205136
Ozzy Osbourne
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=32351
Luigi:
Biker luigi
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=32137
Cactaur
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=24997
Mario:
Mafia Mario
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=4574
Toon Link:
Toon Sephiroth this is just too adorable
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=24427
Toon Squall Also adorable
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=24457
Link:
Monster hunter with sword and shield
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=24457
Amy rose
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=26192
Female Link
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=12376
Ike:
Pyramid Head
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=203780
Silver Knight from dark souls
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=202746
Matoi Ryuko from Kill la Kill
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=36135
Pit:
Bellus Angelus, Alteria
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=16991
Female Pit
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=10497
Pikachu:
Pikathor Because its adorable
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=27878
Bowser:
Crystal Beetle
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=204770
Ness:
Vivian
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=30503
Lucario
Chaos Zero (sonic adventures)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=30651
Peach:
Leavanny
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=25448
OK STAGE TIME!!!
I checked to make sure these all work with 3.0
Perfect Chaos v2 (Sonic Adventure)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=14549
Edit: (More recently updated one with rain and better animation on chaos!)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=14550
Great Desert (Monster Hunter)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=9241
New Skyworld
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=204949
Poke Floats 2
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=19920
Docter Wily's Castle
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=35852
Lanayru Desert (Legend of Zelda: Skyward Sword)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=35892
Competitive Molgera's Room
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=35814
Venus Lighthouse (Golden Sun) EDIT!! gave correct link now
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=36395
Casino Night Zone M
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=204557
(((These next ones are neat but not sure if 3.0 compatible)))
Gloam Valley (Super Paper Mario)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=18037
Yamato's Arc
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=24659
Phoenix Wright Court Case
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=16943
Donut Plains (Super Mario World)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=24691
Aquatic Mine (Sonic Adventure 2)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=20607
Central Highway (Maverick Hunter X)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=35574
Deku Palace (Legend of Zelda Majora's Mask)
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=36447
Some random other things I found
here is an Announcer from project monolith
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=205103
And a replacement for Goldeen. MAGIKARP IS ALL
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=6820
And this makes the metal box into a golden box!
http://forums.kc-mm.com/Gallery/BrawlView.php?Number=26226
Also, we totally need to get a smash ball texture for Patts face. IT MUST BE DONE!
Welp, maybe that was too much.. oh well! im sure it made up for the lack of requests!!
Looking through the vault gave me a headache to a degree... There are not only a lot of Textures, but many of which I wasn't even sure would work in the game, I'm so glad people like you make these packs, otherwise people like me would never be able to experience these awesome things!