User blog comment:Tmac55/rathlos ruby/@comment-1582813-20120812060233

Judging from what I've looked up using this Wikia... Rathalos_Carves Azure_Rathalos_Carves Silver_Rathalos_Carves ... is that depending on your preference, you need to slay or capture a High Rank Rathalos. For now, your best bet would be to cut the tail and capture a Silver Rathalos. Other than that, try to rank up to HR6 so you can do Double Trouble in the guild hall. That quest tends to yield many rubies.