I read that only the wii games use .mdl0 files, so if i wanted to import a model from megaman x8 (PS2) could I import the model?

Well I am thinking about switching from Gecko OS to Riivolution because i read that riivolution can change the sfx and the announcers call, but is there a guide anywhere or can someone help me on how to change all my brawlbox stuff like the menchrChrface.047 for shadows new face?
^I already know how to change sc_selcharacter using brawlbox to change the stance of the character when you select them etc. etc.
But I saw that riivolution allows sfx and announcer voice change, so I wanted to see it, but I have no clue how to change it, I think I need to use common5 instead of sc_selcharacter with riivolution but im not sure, so can someone help?

Also does anyone know if its possible to adds codes onto a already made gct?

I read somewhere that 3.5.1 is not compatible with sfx sounds and riivolution, so do I need to get a lower version of the file patch code for sound effects to work?

When I get a pcs file how do i create a pac using brawlbox? And is it possible to do the same thing but with a pac to create a pcs? Ive tried it before but it crashes my game.

If i have a gct file in my sd card already but i want to put another code on it, do I have to recreate a whole new gct or can i just export that code and it will automatically stay with my old codes already on the gct?

Well I download some motionetc packs for different chars like, Naruto over Rob and Gerudo prince ganondorf and they include a motionetc file and the pcs, and pac and i set them to fitganon00, and i have that extra fitganon pac file. Im not sure if that one is just useless but i keep it and some other textures that keep it like Shadowkong works just fine, can anyone help me? My game just freezes everytime i try the ganondorf one and some others.