Offensive Core: Mega Metagross + Hydreigon + Sylveon
Here is my core I've been using recently. This core revolves around Rock Polish Metagross by eliminating Metagross's checks and sweeping late game.
Hydreigon is a very underrated sweeper when it comes to defeating defensive cores. The EVs maintain its weird but effective speed tier while maintaining power. Draco meteor allows Hydreigon to get past bulky physical walls and steel types that Metagross can't get through. Dark pulse is a good STAB that allows Hydreigon to take on Psychic and Ghost types. Fire Blast is used over Flash Cannon because of its teammate Metagross so it frees up a moveslot. Fire Blast KOs the bulky steel types like Skarmory, Ferrothorn, Scizor, etc that would stop Metagross's late game sweep. Finally, Superpower hits Pokemon that Metagross hates dealing with, plus getting the surprise jump on Bisharp, Air Balloon Heatran, and Air Balloon Excadrill.
I never thought that Hyper Voice would be so deadly combined with Choice Specs and Pixilate? With Hyper Voice Sylveon allows me to defeat Mega Sabelye, Mega Gyarados, and Dragon types. Psyshock is used to help gets you past the Poison-types that resist Hyper Voice, like Amoonguss and Mega Venusaur. Shadow Ball is the least used moved but it still allows me to get past Jirachi, Bronzong, and opposing Mega Metagross. You could argue that the Cleric set could work better with this core but I chose not to.
Finally we get to Mega Metagross. He (IMO) the best late-game sweeper in the current OU metagame thanks to Rock Polish. With its checks and counters out of the way there is no stopping him once you set up a Rock Polish. With the current 176 speed EVs, "an Adamant Nature lets Mega Metagross outpace neutral-natured base 100 Speed Pokemon unboosted and outspeed everything up to Adamant Sand Rush Excadrill with Rock Polish." Meteor Mash is the main STAB of choice backed by Tough Claws is incredibly powerful. Zen Headbutt is the secondary STAB with a nice chance to flinch the opponent. Earthquake is use over Hammer Arm in the final slot because I didn't want to drop Metagross's speed during a late game sweep.



Here is my core I've been using recently. This core revolves around Rock Polish Metagross by eliminating Metagross's checks and sweeping late game.
Hydreigon is a very underrated sweeper when it comes to defeating defensive cores. The EVs maintain its weird but effective speed tier while maintaining power. Draco meteor allows Hydreigon to get past bulky physical walls and steel types that Metagross can't get through. Dark pulse is a good STAB that allows Hydreigon to take on Psychic and Ghost types. Fire Blast is used over Flash Cannon because of its teammate Metagross so it frees up a moveslot. Fire Blast KOs the bulky steel types like Skarmory, Ferrothorn, Scizor, etc that would stop Metagross's late game sweep. Finally, Superpower hits Pokemon that Metagross hates dealing with, plus getting the surprise jump on Bisharp, Air Balloon Heatran, and Air Balloon Excadrill.
I never thought that Hyper Voice would be so deadly combined with Choice Specs and Pixilate? With Hyper Voice Sylveon allows me to defeat Mega Sabelye, Mega Gyarados, and Dragon types. Psyshock is used to help gets you past the Poison-types that resist Hyper Voice, like Amoonguss and Mega Venusaur. Shadow Ball is the least used moved but it still allows me to get past Jirachi, Bronzong, and opposing Mega Metagross. You could argue that the Cleric set could work better with this core but I chose not to.
Finally we get to Mega Metagross. He (IMO) the best late-game sweeper in the current OU metagame thanks to Rock Polish. With its checks and counters out of the way there is no stopping him once you set up a Rock Polish. With the current 176 speed EVs, "an Adamant Nature lets Mega Metagross outpace neutral-natured base 100 Speed Pokemon unboosted and outspeed everything up to Adamant Sand Rush Excadrill with Rock Polish." Meteor Mash is the main STAB of choice backed by Tough Claws is incredibly powerful. Zen Headbutt is the secondary STAB with a nice chance to flinch the opponent. Earthquake is use over Hammer Arm in the final slot because I didn't want to drop Metagross's speed during a late game sweep.
Metagross-Mega @ Metagrossite
Ability: Tough Claws
Shiny: Yes
EVs: 80 HP / 252 Atk / 176 Spe
Adamant Nature
- Rock Polish
- Meteor Mash
- Zen Headbutt
- Earthquake
Hydreigon (M) @ Life Orb
Ability: Levitate
EVs: 24 Atk / 252 SpA / 232 Spe
Mild Nature
- Draco Meteor
- Dark Pulse
- Fire Blast
- Superpower
Sylveon (M) @ Choice Specs
Ability: Pixilate
EVs: 172 HP / 252 SpA / 82 Spe
Modest Nature
IVs: 0 Atk
- Hyper Voice
- Psyshock
- Shadow Ball
- Baton Pass
Ability: Tough Claws
Shiny: Yes
EVs: 80 HP / 252 Atk / 176 Spe
Adamant Nature
- Rock Polish
- Meteor Mash
- Zen Headbutt
- Earthquake
Hydreigon (M) @ Life Orb
Ability: Levitate
EVs: 24 Atk / 252 SpA / 232 Spe
Mild Nature
- Draco Meteor
- Dark Pulse
- Fire Blast
- Superpower
Sylveon (M) @ Choice Specs
Ability: Pixilate
EVs: 172 HP / 252 SpA / 82 Spe
Modest Nature
IVs: 0 Atk
- Hyper Voice
- Psyshock
- Shadow Ball
- Baton Pass
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