Hi! I like the use of Gliscor in your team. Gliscor's a pretty underrated pokemon in my opinion; it can do a decent job in balance and stall teams. You have a pretty decent defensive core going with Ferrothorn, Gliscor, and Gastrodon. Ferrothorn helps take care of water types and Kyurem-Black that can take on Gliscor, while Gliscor can switch into fighting types and other physical attackers that beat Ferrothorn. Meanwhile, Gastrodon takes on Thundurus and Mega Manectric which threatens both Gliscor and Ferrothorn. With that said, your team struggles with Keldeo and Tornadus-Therian, both of which are very popular pokemon in the OU metagame right now. Both of these pokemon outspeed and 2HKO most of your team. Talonflame is your only pokemon that can threaten these two, since Galvantula is outsped and OHKOed by Tornadus-Therian once the Focus Sash is broken and Galvantula has to win a speed tie to outspeed Keldeo. Mega Pinsir can also be a problem once Talonflame is gone and Mega Blastoise is weakened. Also, some of your pokemon's sets aren't viable.
To help with Keldeo, I suggest running Latias over Mega Blastoise.
Latias @ Life Orb
Ability: Levitate
EVs: 72 HP / 184 SpA / 252 Spe
Timid Nature
- Defog
- Draco Meteor
- Psyshock
- Healing Wish
Now that the mega slot is open, I suggest running Mega Manectric over Galvantula to be able to deal with Tornadus-Therian and Mega Pinsir.
Manectric @ Manectite
Ability: Lightning Rod
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Volt Switch
- Thunderbolt
- Flamethrower
- Hidden Power Ice
Mega Manectric also helps with the offensive side of this team, adding a powerful pokemon that can pivot, revenge kill, and potentially sweep.
Finally, there are some changes I want to make to the remaining pokemon. The first of which would be to change Talonflame's set to the specially defensive set.
Talonflame
Ability: Gale Wings
EVs: 248 HP / 252 SpD / 8 Spe
Careful Nature
- Acrobatics
- Roost
- Taunt
- Will-O-Wisp
This Talonflame set gives you an extra switch-in to Mega Gardevoir, which standard offensive Talonflame sets can only switch into once without using Roost. Nothing else on the team likes to switch into Mega Gardevoir's Hyper Voice, bar Ferrothorn, which gets 2HKOed by Focus Blast. Taunt also helps you deal with stall teams a bit better.
The next change I want to make is to change Gliscor's set to the Swords Dance Stallbreaker set.
Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 244 HP / 8 Def / 200 SpD / 56 Spe
Careful Nature
- Swords Dance
- Earthquake
- Knock Off
- Roost
These EVs make sure that Gliscor can outspeed Adamant Bisharp and Breloom, survive a +2 Bisharp's Life Orb boosted Sucker Punch, and retain as much bulk as possible. Roost is the better move compared to Substitute, since the Toxic Orb and Poison Heal combination isn't enough to reliably keep it alive. Knock Off is better than Facade for this team because it allows for pokemon to lose important items such as Assault Vest on pokemon like Tornadus-Therian and Azumarill, Eviolite on Chansey, and Leftovers.
Ferrothorn's set should be changed to run an EV spread of 252 HP / 88 Def / 168 SpD with a Relaxed Nature in order to avoid the 2HKO from Manaphy's Ice Beam after a Tail Glow, and change Rest to Gyro Ball. Rest isn't a very good move on Ferrothorn and it takes place over more important coverage moves. Gyro Ball is a STAB move to use against Fairy types and deal a lot of damage to fast attackers.
Gastrodon's set should be changed to run an EV spread of 252 HP/ 252 Def / 4 SpD and change Whirlpool and Stockpile to Scald and Ice Beam. Trapping pokemon isn't necessary on this team so Whirlpool isn't needed, and Ice Beam works better than Stockpile for the team.
Good luck and have fun with the new team!
Summary of Changes
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Importable:
Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 244 HP / 8 Def / 200 SpD / 56 Spe
Careful Nature
- Swords Dance
- Earthquake
- Knock Off
- Roost
Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 88 Def / 168 SpD
Relaxed Nature
- Stealth Rock
- Leech Seed
- Gyro Ball
- Power Whip
Gastrodon @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Scald
- Ice Beam
- Toxic
- Recover
Talonflame
Ability: Gale Wings
EVs: 248 HP / 252 SpD / 8 Spe
Careful Nature
- Acrobatics
- Roost
- Taunt
- Will-O-Wisp
Latias @ Life Orb
Ability: Levitate
EVs: 72 HP / 184 SpA / 252 Spe
Timid Nature
- Defog
- Draco Meteor
- Psyshock
- Healing Wish
Manectric @ Manectite
Ability: Lightning Rod
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Volt Switch
- Thunderbolt
- Flamethrower
- Hidden Power Ice