Cloyster sucks now because of the priority running around. Just putting this out there.
Take note that Charizard Y teams are rather specialized, and need the following:
-Fighting Pokemon that resists Steel (Infernape, Keldeo, Lucario; Keldeo may not be available to you) for handling Bisharp and smashing Chansey in
-bulky Ground Pokemon (Therian Landorus, Hippowdon, Garchomp) to deal with Rock Pokemon
-Rapid Spin/Defog support for getting Stealth Rock off (better ones are Excadrill and
[email protected])
-Pursuit user for dealing with opposing
[email protected] (Bisharp, Tyranitar, Scizor)
-Bird spam check/counter (Wash Rotom, Thundurus, Zapdos) to get rid of Talonflame, Staraptor or Mega Pinsir
Lucario:
-Swords Dance
-Close Combat
-Extreme Speed
-Iron Tail/Crunch/Ice Punch
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb
Infernape:
-Fire Blast/Flare Blitz
-Close Combat
-Mach Punch
-Hidden Power (Ice)/Thunder Punch/Grass Knot
Nature: Hasty/Naive
EVs: 168 Atk/88 SAtk/252 Spe
Item: Life Orb
Ability: Iron Fist
Therian Landorus:
-Stealth Rock
-Earthquake
-U-turn
-Stone Edge/Rock Slide/Knock Off
Nature: Impish
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers/Rocky Helmet
Garchomp:
-Stealth Rock
-Outrage/Dragon Claw
-Earthquake
-Fire Blast/Swords Dance
Nature: Naive/Jolly
EVs: 252 Atk/4 SAtk/252 Spe
Item: Focus Sash/Lum Berry/Rocky Helmet
Hippowdon:
-Stealth Rock
-Earthquake
-Slack Off
-Whirlwind/Rock Slide/Stone Edge
Nature: Impish/Careful
EVs: 252 HP/72 Def/184 SDef
Item: Leftovers
Ability: Sand Stream
Excadrill:
-Earthquake
-Iron Head
-Rock Slide
-Rapid Spin
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb/Air Balloon
Ability: Sand Rush
Latias:
-Draco Meteor
-Psyshock
-Defog
-Healing Wish
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Latios:
-Draco Meteor
-Psyshock
-Surf/Hidden Power (Fire)/Earthquake
-Defog
Nature: Timid/Hasty
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Bisharp:
-Sucker Punch
-Iron Head
-Knock Off
-Pursuit
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Black Glasses/Dread Plate
Ability: Defiant
Scizor:
-U-turn
-Bullet Punch
-Superpower
-Pursuit
Nature: Adamant
EVs: 248 HP/252 Atk/8 SDef
Item: Choice Band
Ability: Technician
Tyranitar:
-Stealth Rock
-Rock Slide
-Pursuit
-Fire Blast
Nature: Sassy
EVs: 248 HP/136 Def/124 SDef
Item: Smooth Rock/Leftovers
Ability: Sand Stream
or
-Stone Edge
-Crunch
-Pursuit
-Superpower/Fire Blast
Nature: Jolly/Naive
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Scarf
Ability: Sand Stream
Wash Rotom:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split
Nature: Bold/Calm
EVs: 248 HP/216 Def/44 Spe or 248 HP/216 SDef/44 Spe
Item: Leftovers
Thundurus:
-Thunderbolt
-Hidden Power (Ice)
-Focus Blast/Psychic
-Thunder Wave
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb/Leftovers
Ability: Prankster
or
-Nasty Plot
-Thunderbolt
-Hidden Power (Ice/Flying)
-Focus Blast/Thunder Wave/Substitute
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb/Leftovers
or
-Thunderbolt
-Hidden Power (Ice)
-Knock Off
-Superpower/Thunder Wave
Nature: Naive
EVs: 76 Atk/180 SAtk/252 Spe
Item: Life Orb
Zapdos:
-Thunderbolt/Volt Switch
-Roost
-Defog/Hidden Power (Ice)
-Heat Wave/Toxic
Nature: Bold
EVs: 252 HP/172 Def/68 SAtk/16 Spe
Item: Leftovers