Okay, a 1v1 team is basically a 1 on 1 battle, each player has 1 pokemon.
I have 3 pokemon who I normally rotate in and out, so just remember the style of battling that's being used.
Froslass (F) @ Focus Sash
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Trait: Cursed Body
EVs: 4 HP / 252 SAtk / 252 Spd
Modest Nature (+SAtk, -Atk)
- Thunder Wave
- Hex
- Ice Beam
- Destiny Bond
My favorite most used 1v1 rotation, Firstly, Fross walls out Porygon-Z, who is a very popular 1v1 pokemon, for it's Hyper Beam being so ridiculous, While being immune to Quick Attack, Extreme Speed, Vacuum Wave, and Mach punch. ( Lots of canceled out priority ). Thunder Wave will paralyze anything that's not a ground type ( Ice Beam takes ground types :> ) And then Hex gets boosted power, or Ice Beam chimes in for a hit. Destiny Bond can end things in a draw ( Always fun fun ).
Rhyperior (M) @ Choice Band

Trait: Solid Rock
EVs: 252 HP / 252 Atk / 4 Def
Adamant Nature (+Atk, -SAtk)
- Rock Wrecker
- Outrage
- Megahorn
- Earthquake
I used the type coverage calculator, and saw that Rock Dragon Bug and Ground.
Gets 222 Normal Effectiveness, and 441 Super Effectiveness. 0 and 0 For Not Very and None.
140 Attack stat, maxed with Nature and Ev's, with a Choice band!
Rock Wrecker is pretty much a Guarenteed OHKO agaisn't just about anything that it hits Neutral, Outrage is for those pesty dragons ( Oh look at me! I have a Garchomp ! ) Megahorn offers high powered coverage, along with Earthquake for STAB and coverage. This guy is my brute force " I hit you, you die " Competitor.
Charizard (M) @ Choice Scarf

Trait: Blaze
EVs: 4 HP / 252 SAtk / 252 Spd
Modest Nature (+SAtk, -Atk)
- Fire Blast
- Air Slash
- Dragon Pulse
- Hidden Power [Electric]
PO lets Charizard's Fire Blast hit WAY more often, Air Slash is STAB and Dragon Pulse also covers those pesty dragons, HP Electric ( I tested in the Coverage Calculator ) Gives the best Super Effective coverage with my Other moves being Considered. My Quick Choice Scarf killer, not hindered by Stealth Rocks.
Well, these guys are my team that I switch in and out for 1v1 battles, when giving suggestions please keep in mind, this is for 1v1. So I don't wanna hear " Don't use Charizard, Stealth Rocks hurt him too bad!! ".