Tyranitar @ Smooth Rock/leftovers
Ability: Sand Stream
EVs: 248 HP 252 Def 8 Spd OR 252 HP or 248 HP / 156 Def / 104 SpA
Relaxed Nature
- Ice beam
- Crunch
- Stealth Rock
- Fire blast/Stone edge
Honestly, this is a much better Tyranitar set, As it allows Tyranitar to take more hits effectivly, Crunch Is better than pursuit, especially if the Lati@s decide not to switch out and it hits them harder than stone edge without the miss chance, Fire blast and ice beam provide for better coverage than what your moveset had. Ice beam allows T-tar to get around Ground/flying types such as Landorus, Gliscor etc. Whether as Fire blasts main target is Ferrothorn, but is useful for targets such as Scizor/Bisharp/excadrill if they happen to switch in, as Tyranitar easily invites them in and acts as a lure. you can run the 2nd Ev spread I suggested as this allows tyranitar to 1hko any landorus variant after stealth rock including the 252HP variant.
Latios (M) @ Life Orb
Ability: Levitate
EVs: 4 Def/ 252 Spa / 252 Spe
Timid Nature
IVs: 29 hp
- Draco Meteor
- Psyshock
- Hidden Power [Fire]
- Surf/Thunderbolt/Roost
After looking at your Team, it looks like you want to run an offensive latios without defog. putting 4 evs into defense and 29 Ivs and HP allows latios to get the most out of it's life orb and gaining it an extra attack due to it being 299, which is an odd amount of HP, this also allows it to switch into stealth rock an extra time. you can run roost, however Surf/thunderbolt are nice coverage moves on latios. Surf helps it check Heatran, whether as Thunderbolt is for Skamory which resists it's stab moves.
Excadrill @ Air balloon/Life orb
Ability: Sand Rush
EVs: 4 HP / 252 Atk / 252 Spe
Adamant/jolly nature
- Earthquake
- Iron Head
- Rapid Spin
- Rock Slide
This is probably the most important change to the team you can possibily make, you have a tyranitar on the team, you should make use of Excadrill's Sand rush ability as it's speed doubles in the sand allowing it to beat scarfers and hold another item, also Scarfed rapid spin is not good as it makes excadrill setup fodder and has to switch out. Air balloon is preffered to give excadrill a ground immunity, but you could run a life orb if you wish. This really helps out since Tyranitar excadrill is too much of a good core to pass down.
Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 248 HP / 92 def / 168 SpD
Relaxed Nature
IVs: 0 Spe
- Power Whip
- Leech seed
- Thunder Wave
- Protect
this is the final pokemon that should be changed on the team, this allows ferrothorn to be a mixed wall, giving it a nice Special defense boost, this will also help thanks to your tyranitar providing sand giving it even more Special defense in the sand. However this set allows you to become more of a mixed wall and is essential for protecting against things like Fire blast from tyranitar and is a much efficient ev spread overall. Leech seed should be on ferrothorn to help it gain any hp lost back from protect, protect will also help it scout any attacks that could threaten ferrothorn and switch out. Gyro ball and thunder wave is counter productive