ORAS 1U Ferrothorn on both Stall and Offense!

Hazard-Focussed Stall:

Spoiler: Importable

Lugia @ Leftovers
Ability: Multiscale
EVs: 252 HP / 252 Def / 4 Spe
Bold Nature
IVs: 0 Atk
- Aeroblast
- Roost
- Whirlwind
- Toxic

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 252 SpD / 4 Spe
Careful Nature
- Toxic
- Spikes
- Leech Seed
- Power Whip

Palkia @ Leftovers
Ability: Pressure
EVs: 248 HP / 252 SpD / 8 Spe
Calm Nature
- Rest
- Sleep Talk
- Dragon Tail
- Surf

Landorus-Therian @ Earth Plate
Ability: Intimidate
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Stealth Rock
- Earthquake
- Stone Edge
- Toxic

Yveltal @ Dread Plate
Ability: Dark Aura
EVs: 248 HP / 252 Def / 8 Spe
Impish Nature
- Foul Play
- Roost
- Toxic
- Sucker Punch

Arceus-Poison @ Toxic Plate
Ability: Multitype
EVs: 252 HP / 64 Def / 192 Spe
Jolly Nature
- Poison Jab
- Will-O-Wisp
- Recover
- Defog

Spoiler: Description

Even more stall! It's nice to show that in a metagame with all of these powerful threats around, stall is still very much present and full of variety. This one is pretty simply based around hazard control: Lando-T is a rocks setter that does a number to Mega Sableye, Arceus-Poison is maybe the most reliable defogger in the tier, thanks to its immunity to Toxic, and Ferrothorn provides Spikes support. It is EV'd to outspeed Mega Sableye, which usually doesn't run any speed EVs and has the same base speed. Since this team has Arceus-Poison and Lugia, running Power Whip is preferred to Gyro Ball as the attack since it does much more to Mega Sableye (actually does min. 30% vs the standard set!), as well as hitting Arceus-Electric neutrally. Also, having Ferrothorn, Lugia, and Yveltal means that Lando-T has a lot of back-up, allowing me to run a more aggressive spread with a shorter life-span, since the Pokemon it checks - such as Zekrom, Ekiller, and Mega Blaziken - are deecently well covered by its partners. Stalltwo is one of the team's bigger weaknesses, but you have the tools to play around it: Lando-T is your main one, which can try and land Toxic on it, since it's likely to wisp initially since Earth Plate-boosted Earthquake 2HKOs fairly comfortably. Also, Palkia can phaze it around at least.

SpecsOgre Offense:

Spoiler: Importable

Kyogre @ Choice Specs
Ability: Drizzle
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Water Spout
- Thunder
- Ice Beam
- Origin Pulse

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 252 SpD / 4 Spe
Careful Nature
- Spikes
- Toxic
- Leech Seed
- Power Whip

Latios (F) @ Soul Dew
Ability: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Roost
- Psyshock
- Calm Mind / Surf

Genesect @ Choice Scarf
Ability: Download
EVs: 252 Atk / 4 Def / 252 Spe
Hasty Nature
- Iron Head
- U-turn
- Explosion
- Extreme Speed

Tyranitar @ Chople Berry
Ability: Sand Stream
EVs: 248 HP / 236 Atk / 24 Def
Adamant Nature
- Stealth Rock
- Stone Edge
- Payback
- Pursuit

Arceus-Ghost @ Spooky Plate
Ability: Multitype
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Judgment
- Recover
- Focus Blast

Spoiler: Description

The idea behind this is pretty simple. SpecsOgre is a nuke, TTar provides pursuit support against the lati twins which are amongst its better answers. TTar can also get up rocks vs sab fairly nicely, and also anti-leads stuff like deo-a and deo-s well, and checks Ho-Oh alongside ogre. ScarfSect can u-turn into specsogre which is pretty swanky. Ferro provides spikes and a secondary anti-kyogre measure alongside latios. Anyway it's a pretty swanky lil team, should be played pretty aggressively because a lot of stuff on it can die pretty quickly but do heavy damage in the meantime. Note that Surf and CM are both slashed on Latios. Surf is an option for a harder hit on Ho-Oh, but CM + Draco makes things drop so... your choice. Defog isn't worth it here since the team doesn't have that much staying power anyway whilst having its own spikes it would rather not clear.