Sand is really hard to get right when rain and sun just shit on it all day long. Tyranitar by itself works well as a bulky attacker as long as the opponent isn't a fighting type. But having Tyranitar on your team means you almost have to build around it, rather than us it to fill a gap.
Mega Heracross to drop to C+: Yes
Meloetta to rise to C: No
Clefable to rise to C: NO!
Clefairy to rise to C:Double NO !!
Hariyama to rise to C+: Yes, should rise higher IMO
Rhydon to rise to C+: No
Musharna to drop to D: Yes
Tornadus to drop to C+: Yes