I'm playing White 2 and I want to know how I can raise my Zweilious's Special Attack IVs.
Yes. You can mess with the IV's too change the Hidden Power type. http://pokemonelite2000.com/forum/showthread.php?t=46234 ^This website should tell you all about IV breeding. Hope I helped! To add, they cannot be raised normally, it has to be by breeding.
No IV's can't be changed.
you cant change the ivs of a Pokemon you already have but you can improve them through breeding