The assist trophy and the pokeball characters goes in the common3_en.pac file, download that and make sure its the right one. While your at it, you have to download brawlbox v0.67 in order to insert them inside the file. By the time you get to the file you wanted to replace, you right click the file and click replace and then you click save as and it should work properly. And with the SSS and CSS, same thing except you have to get common5_en.pac and by using the same method like you do with the common3_en.pac
i think that i learned now where to place them:
http://forums.kc-mm.com/index.php?topic=5.0but i really need to convert the csp and sss images into brres??