Complete move listings, EVs and items would be appreciated.
Skarmory should look something like this to make the most out of its physical walling capabilities (note that this one is cartridge-friendly, as the current Skarmory set in progress of testing needs moves from past games, such as Defog and Counter):
-Stealth Rock/Spikes
-Whirlwind
-Roost
-Brave Bird/Taunt
Nature: Impish/Bold
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers/Rocky Helmet
Ability: Sturdy
Alakazam shouldn't be run as a lead. Its frailty often gets in the way of KOing healthy, bulky opponents. It should only be brought in after a teammate is KOed and into the range of a weakened opponent:
-Psyshock/Psychic
-Shadow Ball
-Focus Blast
-Hidden Power (Ice)/Thunder Wave/Dazzling Gleam
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Focus Sash
Ability: Magic Guard
Salamence does physical attacking better than special attacking in singles. It's also overshadowed by other physical Dragon Pokemon such as Charizard X and Dragonite. Special attacking Dragons to consider are
[email protected] and Noivern, though the former two can only be obtained via Poke Transfer (note: I use
[email protected] to refer to Latias and Latios simultaneously):
Latios:
-Draco Meteor
-Psyshock
-Thunderbolt/Hidden Power (Fighting)/Earthquake
-Defog/Roost/Recover
Nature: Timid/Hasty
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb
or
-Draco Meteor
-Psyshock
-Surf/Hidden Power (Fire)
-Trick/Hidden Power (Fire)
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Scarf
or
-Reflect
-Light Screen
-Memento
-Draco Meteor/Psychic
Nature: Timid
EVs: 252 HP/4 SDef/252 Spe
Item: Light Clay
Latias:
-Draco Meteor
-Psyshock/Thunderbolt
-Defog
-Healing Wish
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Noivern:
-Draco Meteor
-Hurricane
-Flamethrower/Focus Blast
-Taunt/Roost
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Ability: Infiltrator
Charizard X should look something like either of these:
-Dragon Dance
-Flare Blitz/Earthquake
-Dragon Claw
-Roost
Nature: Adamant
EVs: 248 HP/152 Atk/108 Spe
Item: Charizardite X
Ability: Blaze
or
-Dragon Dance
-Flare Blitz
-Dragon Claw/Outrage
-Earthquake
Nature: Adamant/Jolly
EVs: 40 HP/252 Atk/216 Spe or 252 Atk/4 Def/252 Spe
Item: Charizardite X
Ability: Blaze
or
-Flare Blitz/Earthquake
-Dragon Claw
-Will-o-Wisp
-Roost
Nature: Careful
EVs: 248 HP/228 SDef/32 Spe
Item: Charizardite X
Ability: Blaze
Since you have Pokemon that are weak to Stealth Rock, Mandibuzz or Excadrill can provide hazard removal support:
Mandibuzz:
-Foul Play
-Roost
-Taunt/Whirlwind
-Defog
Nature: Bold
EVs: 248 HP/136 Def/108 SDef/16 Spe
Item: Leftovers
Ability: Overcoat
Excadrill:
-Earthquake
-Iron Head
-Rapid Spin
-Rock Slide/Stealth Rock
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Leftovers/Air Balloon
Ability: Mold Breaker
or
-Earthquake
-Iron Head
-Rock Slide
-Rapid Spin
Nature: Adamant/Jolly
EVs: 252 Atk/4 Def/252 Spe (Choice Scarf) or 120 HP/136 Atk/252 SDef (Assault Vest; Adamant only)
Item: Choice Scarf/Assault Vest
Ability: Mold Breaker
Mandibuzz serves as a mixed wall on the team for reference.