
Hello Smogon!
Welcome to my RMT! I wanted to post this team because it was the team I used to first break 1400 (wow im bad lol). I actually started using Mega Gardevoir because it is my sister's favorite Pokemon and she wanted me to build a team around her. So I did, and it ended up being the best team I ever built. Well it ended up being changed to Diancie lol
Proof of Peak:
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The Team:
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Teambuilding Process:

I started with an insanely powerful wallbreaker and one of the best Fairy types in OU, Mega Gardevoir.



Sand has great type synergy with Mega Gardevoir because she can switch into Fighting types for TTar and Excadrill and they can kill steels for Gardevoir.




Keldeo helps kill more Steel types like Ferrothorn and Skarmory.





Thundurus is a great special sweeper and can cripple fast things like Mega Lopunny that really hurt this team.






Gliscor walls and sets up on Excadrill and Mega Lopunny without Ice Punch and is a great stallbreaker.






Changed team based on suggestions by Nedor






born ready suggested Amoonguss to better deal with Waters, especially Azumarill






Since this left the team very weak to Flying types, born ready suggested Mega Diancie
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A Closer Look:
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Diancie
Item: Diancite
Ability: Clear Body
EVs: 36 HP / 32 Atk / 252 SpA / 188 Spe
Nature: Rash (+SpA, -SpD)
Rock Polish
Moonblast
Diamond Storm
Earth Power
Gardevoir was changed to Diancie because Gardevoir is pretty underwhelming in ORAS, especially right now with all the faster offensive teams running around. Diancie also provides a wincon against faster teams with Rock Polish. Moonblast and Diamond Storm are spammable STABS and Earth Power covers against Steel types which would otherwise wall her.

Hippowdon
Item: Leftovers
Ability: Sand Stream
EVs: 252 HP / 144 Def / 112 SpD
Nature: Impish
Earthquake
Stone Edge
Stealth Rock
Slack Off
Because of Nedor's suggestions, I changed Tyranitar to mixed defensive Hippowdon. Hippo provides a way to reliaby check Excadrill now that Gliscor is gone, and it also helps with Mega Lopunny.

Excadrill
Item: Life Orb
Ability: Sand Rush
EVs: 252 Atk / 4 Def / 252 Spe
Nature: Adamant (+Atk, -SpA)
Earthquake
Iron Head
Rock Slide
Swords Dance
Next up is the main physical sweeper and semi-wallbreaker of my team, Excadrill. In sand, he outspeeds 99.9% of Pokemon in OU and with a great attack stat he can easily sweep balance and HO teams. Life Orb boosts his power even higher and the EVs max out speed and power. Rock Slide covers for Flying types that are immune to EQ and SD helps Exca wallbreak and sweep easier.

Keldeo
Item: Choice Specs
Ability: Justified
EVs: 4 Def / 252 SpA / 252 Spe
Nature: Timid (+Spe, -Atk)
Scald
Secret Sword
Hydro Pump
Hidden Power (Electric)
Keldeo was added because I needed a way to check Ferrothorn and Mega Scizor and I have a lot of ways to kill the Lati twins which are problematic for Keldeo. I chose HP Electric because I needed a way to beat Azumarill after it BDs. Choice Specs give Keldeo amazing power and don't give recoil.

Amoonguss
Item: Black Sludge
Ability: Regenerator
EVs: 252 HP / 136 Def / 120 SpD
Nature: Calm (+SpD, -Atk)
Spore
Clear Smog
Giga Drain
Sludge Bomb
Amoonguss is my pivot and counter to most Water types, such as Azumarill and Keldeo. Spore can almost remove a non-grass Pokemon from the game and Giga + Sludge are STABS. Clear Smog removes stat changes which can stop sweeper in their tracks.

Latias
Item: Life Orb
Ability: Levitate
EVs: 72 HP / 184 SpA / 252 Spe
Nature: Timid
IVs: 29 HP / 0 Atk
Draco Meteor
Psyshock
Recover
Defog
Based on Nedor's suggestion, I changed Gliscor to Latias. Latias provides a switch-in to Water types which I desperately needed. Lati also provides Defog support which frees up a moveslot on Excadrill. Draco Meteor has incredible power with Life Orb, and Recover heals off the recoil.
Former Team Members:

Gliscor
Item: Toxic Orb
Ability: Poison Heal
EVs: 244 HP / 8 Def / 200 SpD / 56 Spe
Nature: Careful
Swords Dance
Earthquake
Knock Off
Roost
Last but certainly not least is my secondary physical wall/sweeper/stallbreaker, Gliscor. Gliscor is a Pokemon that can almost do it all, as he is able to wall a good portion of the metagame and he can stallbreak fairly well. Poison Heal is a amazing ability for a defensive Pokemon as it is a status immunity coupled with double leftovers. DOUBLE LEFTOVERS. 244 EVs invested into HP let Gliscor hit a Poison Heal number, allowing it to gain maximal recovery from Poison Heal each turn. 56 Speed EVs enable Gliscor to outpace Adamant Bisharp and Breloom.
Tyranitar
Item: Smooth Rock
Ability: Sand Stream
EVs: 248 HP / 252 Def / 8 SpD
Nature: Relaxed (+Def, -Spe)
Stealth Rock
Crunch
Ice Beam
Stone Edge
Tyranitar was added because he has pretty good synergy with Mega Gardevoir, as she can switch into Fighting type attacks for him, and Tyranitar can switch into Ghost and Poison moves for Gardevoir. Tyranitar is my SR settter and my bird check, both of which are extremely important RN. Crunch and Stone Edge are decent dual STAB coverage, and Ice Beam is coverage for Garchomp and Landorus. The EVs and nature max out Defense because his SpDef is already extremely high with sand up.
Gardevoir
Item: Gardevoirite
Ability: Trace ---> Pixilate
EVs: 24 Def / 232 SpA / 252 Spe
Nature: Modest (+SpA, -Atk)
Hyper Voice
Psyshock
Focus Blast
Will-O-Wisp
What better way to start then with the star of the show. Mega Gardevoir is a crazy powerful wallbreaker and her dual STABs are only resisted by Steel types. Focus Blast covers for that but the accuracy is extremely shaky. Not as shaky as Rock Slide, but still shaky. Will-O-Wisp is a lure for Scizor which does threaten my team if Keldeo dies. Psyshock hits on the physical side, allowing her to break through special walls such as Chansey. Trace is a great ability before mega evolving because you can do many things such as stealing Regenerator from Pokemon such as Amoonguss and Slowbro, utilizing Magic Bounce from Mega Sableye to reflect Will-O-Wisp, taking advantage of Manectric's Lightning Rod, Intimidating Landorus-T and Gyarados, and trapping Magnezone locked into a Hidden Power.
Thundurus
Item: Leftovers
Ability: Prankster
EVs: 4 Def / 252 SpA / 252 Spe
Nature: Timid (+Spe, -Atk)
Nasty Plot
Thunderbolt
Hidden Power (Ice)
Thunder Wave
Next up is my main special sweeper and only way to slow down faster threats, Thundurus Incarnate. Thundurus is one of the only Pokemon in the game with access to prankster T-Wave, which is probably one of the best Ability-move combos in the game RN because offense is everywhere. Nasty Plot allows Thundurus to sweep weakened teams with his pretty good BoltBeam coverage.
Ability: Poison Heal
EVs: 244 HP / 8 Def / 200 SpD / 56 Spe
Nature: Careful
Swords Dance
Earthquake
Knock Off
Roost
Last but certainly not least is my secondary physical wall/sweeper/stallbreaker, Gliscor. Gliscor is a Pokemon that can almost do it all, as he is able to wall a good portion of the metagame and he can stallbreak fairly well. Poison Heal is a amazing ability for a defensive Pokemon as it is a status immunity coupled with double leftovers. DOUBLE LEFTOVERS. 244 EVs invested into HP let Gliscor hit a Poison Heal number, allowing it to gain maximal recovery from Poison Heal each turn. 56 Speed EVs enable Gliscor to outpace Adamant Bisharp and Breloom.

Tyranitar
Item: Smooth Rock
Ability: Sand Stream
EVs: 248 HP / 252 Def / 8 SpD
Nature: Relaxed (+Def, -Spe)
Stealth Rock
Crunch
Ice Beam
Stone Edge
Tyranitar was added because he has pretty good synergy with Mega Gardevoir, as she can switch into Fighting type attacks for him, and Tyranitar can switch into Ghost and Poison moves for Gardevoir. Tyranitar is my SR settter and my bird check, both of which are extremely important RN. Crunch and Stone Edge are decent dual STAB coverage, and Ice Beam is coverage for Garchomp and Landorus. The EVs and nature max out Defense because his SpDef is already extremely high with sand up.

Gardevoir
Item: Gardevoirite
Ability: Trace ---> Pixilate
EVs: 24 Def / 232 SpA / 252 Spe
Nature: Modest (+SpA, -Atk)
Hyper Voice
Psyshock
Focus Blast
Will-O-Wisp
What better way to start then with the star of the show. Mega Gardevoir is a crazy powerful wallbreaker and her dual STABs are only resisted by Steel types. Focus Blast covers for that but the accuracy is extremely shaky. Not as shaky as Rock Slide, but still shaky. Will-O-Wisp is a lure for Scizor which does threaten my team if Keldeo dies. Psyshock hits on the physical side, allowing her to break through special walls such as Chansey. Trace is a great ability before mega evolving because you can do many things such as stealing Regenerator from Pokemon such as Amoonguss and Slowbro, utilizing Magic Bounce from Mega Sableye to reflect Will-O-Wisp, taking advantage of Manectric's Lightning Rod, Intimidating Landorus-T and Gyarados, and trapping Magnezone locked into a Hidden Power.

Thundurus
Item: Leftovers
Ability: Prankster
EVs: 4 Def / 252 SpA / 252 Spe
Nature: Timid (+Spe, -Atk)
Nasty Plot
Thunderbolt
Hidden Power (Ice)
Thunder Wave
Next up is my main special sweeper and only way to slow down faster threats, Thundurus Incarnate. Thundurus is one of the only Pokemon in the game with access to prankster T-Wave, which is probably one of the best Ability-move combos in the game RN because offense is everywhere. Nasty Plot allows Thundurus to sweep weakened teams with his pretty good BoltBeam coverage.



Importable:
You do not have to keep the nicknames
Amoonguss (F) @ Black Sludge
Ability: Regenerator
EVs: 252 HP / 136 Def / 120 SpD
Calm Nature
- Spore
- Clear Smog
- Giga Drain
- Sludge Bomb
Diancie @ Diancite
Ability: Clear Body
EVs: 36 HP / 32 Atk / 252 SpA / 188 Spe
Rash Nature
- Rock Polish
- Moonblast
- Diamond Storm
- Earth Power
Hippowdon @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 144 Def / 112 SpD
Impish Nature
- Earthquake
- Stone Edge
- Stealth Rock
- Slack Off
Excadrill @ Life Orb
Ability: Sand Rush
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Earthquake
- Iron Head
- Rock Slide
- Swords Dance
Keldeo @ Choice Specs
Ability: Justified
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Scald
- Secret Sword
- Hydro Pump
- Hidden Power [Flying]
Latias @ Life Orb
Ability: Levitate
EVs: 72 HP / 184 SpA / 252 Spe
Timid Nature
- Draco Meteor
- Psyshock
- Recover
- Defog
Ability: Regenerator
EVs: 252 HP / 136 Def / 120 SpD
Calm Nature
- Spore
- Clear Smog
- Giga Drain
- Sludge Bomb
Diancie @ Diancite
Ability: Clear Body
EVs: 36 HP / 32 Atk / 252 SpA / 188 Spe
Rash Nature
- Rock Polish
- Moonblast
- Diamond Storm
- Earth Power
Hippowdon @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 144 Def / 112 SpD
Impish Nature
- Earthquake
- Stone Edge
- Stealth Rock
- Slack Off
Excadrill @ Life Orb
Ability: Sand Rush
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Earthquake
- Iron Head
- Rock Slide
- Swords Dance
Keldeo @ Choice Specs
Ability: Justified
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Scald
- Secret Sword
- Hydro Pump
- Hidden Power [Flying]
Latias @ Life Orb
Ability: Levitate
EVs: 72 HP / 184 SpA / 252 Spe
Timid Nature
- Draco Meteor
- Psyshock
- Recover
- Defog

Enjoy :]
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