Oh, I use a different directory with riivolution. It looks like this
SD Root-> brawlmods-> textures->{Figters, stages, system, etc}
I was told to put it in there. I'll try out your way though.
I don't know who told you that; I got the Riivolution from the official webpage and what I wrote above was my directory O_O
So that may be your problem; anyway, it doesn't hurt to try something(usually).