Change terrakions item to babiri berry or life orb. Also you have a massive mamoswine weakness since nothing on your team can actually set up on one. Luc Scizor and Terry scare it out to a point but you have nothing that really wants to risk it. The idea with HO is that you can set up on every single poke the opponent could possibly have.
In 5th gen? Any sweeper that is walled by gliscor, so SD RP terrakion is really good, SD scizor is another nice one! Could always throw in a dragon like SD hax. It's just trail and error for the most part of it.