No tutorials, but the only two to be able to add pokemon to FR are me and Jambo51 (owner of 649 patch) and for Ruby Chaos Rush was the only one. It requires ASM and Repointing everything to a new spot! Too much work. Just replace a pokemon you won't need like farfetch'd or mantine or something. then change the cry, footprint, pkdex data, and image and Voila! You've got good a pokemon! If you need any resources or help with those things please ask, too much to put in a post before I run out of space ;)
Oh, and the ???????? all use the Unown data, so You can't use them without some SERIOUS ASM knowledge {XD}