This is your type resistances table: http://prntscr.com/5xnl8a
As you can see your team has a lot of weaknesses plus your general bulk is poor. 252/252 spam is not optimal, because you can't survive common hits from major threats, and I was thinking you have a serious problem against MegaCharY and Aegiglash.
1) I can suggest you to run only one between SashGengar and ScarfGardevoir, since both have the same function (maybe Gengar is a better offensive support, but you can't run Focus Sash on anyone else).
2) Scrafty's Intimidate is good, but its x4 Fairy weakness and slow Fake Out are major problems. You can choose between Inner Focus Mienshao, which has a fast Fake Out and access to Wide Guard, or Infernape for Fake Out, Mach Punch and Quick Guard. Both of them should run a Focus Sash so you must choose between Gengar or them. Prankster Meowstic is an option if you want to run SashGengar, but it doesn't offer much offensive pressure, while offering a good support with Fake Out, Safeguard, Reflect, Helping Hand, Quick Quard and so on.
3) This is your Mamoswine damage calculation against a Landorus-T
-1 252 Atk Life Orb Mamoswine Ice Shard vs. 4 HP / 0 Def Landorus-T: 130-161 (78.7 - 97.5%) -- guaranteed 2HKO
You may want to run an Adamant nature to solve the problem.
4) Iron Head over Meteor Mash because of flinch rate is a reliable move on MMetagross (you get the same OHKO more or less), and since you have Mamoswine and IcyWind Gengar/Gardevoir you really don't need run Ice Punch. Thunder Punch is a better option since you can deal with Slowbro, Jellicent and even Talonflame and M-CharY:
252+ Atk Metagross Thunder Punch vs. 0 HP / 4 Def Mega Charizard Y: 124-148 (81 - 96.7%) -- guaranteed 2HKO
ThunderPunch + IcyWind can be a fast kill on MCharY
5)I think you are able to choose a 6th member now. Take a look at this too http://3ds.pokemon-gl.com/battle/oras/#double
You can play with the Damage Calculator here: http://pokemonshowdown.com/damagecalc/
As you can see your team has a lot of weaknesses plus your general bulk is poor. 252/252 spam is not optimal, because you can't survive common hits from major threats, and I was thinking you have a serious problem against MegaCharY and Aegiglash.
1) I can suggest you to run only one between SashGengar and ScarfGardevoir, since both have the same function (maybe Gengar is a better offensive support, but you can't run Focus Sash on anyone else).
2) Scrafty's Intimidate is good, but its x4 Fairy weakness and slow Fake Out are major problems. You can choose between Inner Focus Mienshao, which has a fast Fake Out and access to Wide Guard, or Infernape for Fake Out, Mach Punch and Quick Guard. Both of them should run a Focus Sash so you must choose between Gengar or them. Prankster Meowstic is an option if you want to run SashGengar, but it doesn't offer much offensive pressure, while offering a good support with Fake Out, Safeguard, Reflect, Helping Hand, Quick Quard and so on.
3) This is your Mamoswine damage calculation against a Landorus-T
-1 252 Atk Life Orb Mamoswine Ice Shard vs. 4 HP / 0 Def Landorus-T: 130-161 (78.7 - 97.5%) -- guaranteed 2HKO
You may want to run an Adamant nature to solve the problem.
4) Iron Head over Meteor Mash because of flinch rate is a reliable move on MMetagross (you get the same OHKO more or less), and since you have Mamoswine and IcyWind Gengar/Gardevoir you really don't need run Ice Punch. Thunder Punch is a better option since you can deal with Slowbro, Jellicent and even Talonflame and M-CharY:
252+ Atk Metagross Thunder Punch vs. 0 HP / 4 Def Mega Charizard Y: 124-148 (81 - 96.7%) -- guaranteed 2HKO
ThunderPunch + IcyWind can be a fast kill on MCharY
5)I think you are able to choose a 6th member now. Take a look at this too http://3ds.pokemon-gl.com/battle/oras/#double
You can play with the Damage Calculator here: http://pokemonshowdown.com/damagecalc/
