Hey, LucarioarkZ! Got your request.
Solid team! From an initial look, it seems Choice Scarf Landorus is a problem to face. It can take out your Jolteon and Lucario with Earthquake, take out your Gliscor and Scarf Flygon with Hidden Power Ice, and Mienshao doesn't particularly tanking a Sand Force-boosted Earthquake. As Stone_Cold previously stated, your team does seem weak to Outrage spamming, as Gliscor is your only "safe" switch-in. However, it can't tank a couple of boosted Outrages from guys like Haxorus and Salamence. So, in order to help you deal with Outrage users and Landorus, I am seconding Stone_Cold's recommendation of a Physically Defensive Forretress
over Gliscor. It isn't weak to Ice and can beat Dragon Dancers. It will also be able to provide Rapid Spin support - an asset your team would function even better with. Your VoltTurn users (Mienshao, Flygon and Jolteon) are bound to switch in a lot; however, they will quickly fall if they constantly get pummeled by hazards. With Forretress, you can solve your weakness to Dragon Dancers, Landorus and hazards won't be constantly bugging you during the match. Additionally, the BagWorm can also help providing Spikes, an additional hazard that would greatly benefit your offensive-minded team. It adds pressure to your opponent, which is accentuated with your VoltTurn strategy. Solid team, and good luck!
Forretress @ Leftovers | Sturdy
Relaxed Nature | 252 HP / 176 Def / 80 SpD
Rapid Spin | Spikes | Gyro Ball | Volt Switch
Remember to use 0 Speed IVs to maximize Gyro Ball's power.
Summary of Changes:
Gliscor ---> Physically Defensive Forretress