Hey there. Cool team.
1st off, change Rotom-W's ev spread to the standard 112 HP / 252 SpA / 144 Spe spread with a Modest Nature. Gliscor already defeats most physical attackers, and Landorus can still be beaten due to Rotom-W's natural bulk. This spread allows you to hit much harder, and outspeed more threats. Also, run Volt Switch over Thunderbolt. The drop in power is easily made up for by the switch initiative you gain; not to mention, Rotom-W with Volt Switch + Scizor with U-Turn is a very offensive combination, as not many pokemon can defeat Rotom-W and Scizor combined.
Due to the lack of a rapid spinner, run Taunt over Protect on Gliscor. Not only will this stop pokemon such as Forretress from getting free hazards on you, but it will stop Skarmory from phazing you away; Taunt also allows Gliscor to be a menace against stall teams, and can devastate much easier late game.
Run Adamant over Jolly on Excadrill, as the prevalence of Air Balloon will make outspeeding Adamant versions not as useful; Adamant allows your power to increase even more. Also, run Frustration over X-Scissor. X-Scissor is really only useful for Celebi, and +2 LO Frustration still does mass damage to it. Latios defeats Celebi pretty handily regardless. Frustration allows you to do much more damage to Gliscor, and allows you to OHKO standard Rotom-W after a Swords Dance; Frustration also makes Excadrill much more of a threat in general.
Now Rotom-W is a big problem for this team. With Volt Switch combined with Hydro Pump, nothing on your team can take repeated hits; with Sandstorm, entry hazard, and battle damage, Latios will be worn down very quickly. For this reason, run Recover over Psyshock. This will give you a solid counter to Rotom-W; Bliss is not that big of a problem for your team regardless.
Replace Ice Beam on Tyranitar with Pursuit. Pursuit will let you kill off Latios immediately (Scizor takes major damage from it's hits), and will also let you finish off other weakened threats. Ice Beam is extremely predictable now, and after prior damage, Gliscor can easily take you out. Rock Slide is another option in that slot, as it will give you a Volcarona counter, which could be very beneficial, seeing as you'd have to play around it in hopes of killing it with Excadrill.
Overall, solid team. Good luck.