List natures, EVs, items and abilities in the future, plz.
Ampharos is seriously outclassed in the OU (standard) environment. There are better alternatives out there, like Jolteon or Rotom-W, who just happen to be faster than Ampharos:
Jolteon:
-Thunderbolt
-Volt Switch
-Signal Beam
-Hidden Power (Ice)
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Choice Specs/Life Orb
Ability: Volt Absorb
Rotom-W:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split/Hidden Power (Ice)
Nature: Modest
EVs: 232 HP/56 SAtk/220 Spe
Item: Leftovers
or
-Volt Switch
-Hydro Pump
-Thunder Wave/Will-o-Wisp
-Pain Split
Nature: Calm
EVs: 248 HP/28 SAtk/232 SDef
Item: Leftovers
or
-Volt Switch
-Hydro Pump
-Hidden Power (Ice)
-Trick/Thunderbolt
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf
What the heck is up with Metagross' EV spread? What's the point of using Special Attack EVs if you're not using Special moves?:
-Stealth Rock
-Meteor Mash
-Bullet Punch
-Earthquake/Hammer Arm
Nature: Adamant
EVs: 252 HP/96 Atk/160 SDef or 252 HP/252 Atk/4 Spe
Item: Leftovers/Air Balloon
or
-Agility
-Zen Headbutt
-Earthquake
-Meteor Mash/Ice Punch
Nature: Jolly/Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb
or
-Meteor Mash
-Bullet Punch
-Hammer Arm
-Zen Headbutt/Pursuit/Ice Punch
Nature: Adamant
EVs: 164 HP/252 Atk/92 Spe
Item: Choice Band
or
-Meteor Mash
-Hidden Power (Fire)
-Grass Knot
-Zen Headbutt/Earthquake
Nature: Naughty
EVs: 252 HP/228 SAtk/24 Spe
Item: Life Orb
No matter how tempting Charizard is to use in OU, it absolutely sucks in there because of its 4x Stealth Rock weakness and how easily it's worn down. Even though Volcarona also shares a 4x Rock weakness with Charizard, it packs more power while being as fast as Charizard is:
-Quiver Dance
-Fire Blast/Fiery Dance
-Bug Buzz
-Giga Drain/Hidden Power (Ground)
Nature: Timid/Modest
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Lum Berry
or
-Quiver Dance
-Bug Buzz
-Fire Blast/Fiery Dance
-Roost
Nature: Timid
EVs: 240 HP/252 Def/16 Spe
Item: Leftovers
or
-Quiver Dance
-Fire Blast/Fiery Dance
-Bug Buzz
-Rest
Nature: Modest
EVs: 160 HP/236 SAtk/112 Spe
Item: Chesto Berry
Lucario should use Swords Dance over Detect; I don't see much use of that move, tbh. It's 100% outclassed by Protect, and Lucario would rather attack straight away or make itself stronger with Swords Dance than stall for a turn. Make sure the nature is Adamant or Jolly and the EV spread is 4 HP/252 Atk/252 Spe.
Tbh, Espeon is the better option over Umbreon, as the former's Magic Bounce ability bounces back entry hazards (especially Stealth Rock, which Volcarona loathes):
-Reflect
-Light Screen
-Psychic/Psyshock
-Baton Pass/Hidden Power (Fire)
Nature: Timid
EVs: 252 HP/4 Def/252 Spe
Item: Light Clay
Ability: Magic Bounce
Haxorus' Speed tier is rather...awkward. It's better off maxing out on Attack and Speed. Also, it has better coverage moves out there:
-Swords Dance
-Outrage
-Superpower/Low Kick
-Substitute/Aqua Tail/Earthquake
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Fighting Gem/Life Orb/Lum Berry
Ability: Mold Breaker
or
-Outrage
-Earthquake
-Superpower
-Aqua Tail/Dragon Claw/Dual Chop
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Choice Band
Ability: Mold Breaker
or
-Dragon Dance
-Swords Dance
-Outrage
-Earthquake/Low Kick
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Lum Berry/Draco Plate
Ability: Mold Breaker
or
-Dragon Dance
-Outrage
-Earthquake
-Low Kick/Taunt
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Lum Berry/Yache Berry
Ability: Mold Breaker