Conkeldurr still would rather have Guts as its main ability to let it benefit from being statused.
Superpower may be the preferred option in the last slot if you don't have HP Ice, as it helps you nail Ferrothorn.
[email protected] and Celebi are better checks for Water/Fighting 'mons; either one can go over Hydreigon:
Latias:
-Draco Meteor
-Psyshock
-Surf/Hidden Power (Fire)
-Recover/Trick
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Choice Specs
Latios:
-Draco Meteor
-Surf
-Hidden Power (Fire)/Dragon Pulse
-Trick/Psyshock
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf
or
-Draco Meteor/Dragon Pulse
-Surf
-Hidden Power (Fire)
-Recover/Psyshock
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Expert Belt
Celebi:
-Giga Drain/Psychic
-Recover
-U-turn
-Perish Song/Thunder Wave/Stealth Rock
Nature: Calm
EVs: 252 HP/232 SDef/24 Spe
Item: Leftovers
or
-Leaf Storm
-Earth Power/Psychic/Hidden Power (Fire)
-Thunder Wave/U-turn
-Recover
Nature: Modest
EVs: 56 HP/252 SAtk/200 Spe
Item: Life Orb/Leftovers
or
-Nasty Plot
-Giga Drain
-Earth Power/Hidden Power (Fire)
-Psychic/Recover/Hidden Power (Fire)
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb
or
-Leaf Storm
-Hidden Power (Ice/Fire)
-Earth Power/Psychic
-Trick/U-turn
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Scarf
Also, why the heck is Breloom Modest? Adamant or Jolly is definitely the way to go.
And if you're not using Fire Blast on Tyranitar, use a Careful nature.