Are these strategies good for countering setup sweepers?

Question

DURANT:

Durant (M) @ Red Card 
EVs: 6 HP / 252 Atk / 252 Spe 
Ability: Swarm 
Jolly Nature 
- Endure 
- Endeavor 
- X-Scissor 
- Iron Head

After entering into the field before an ally faints, it uses endure. When the opponent attacks it is forced out loosing it's boosts. In the next turn Durant uses endeavor to take advantage of it's 1 HP and letting the next partner revenge kill. (I know that it is susceptible to ghost, priority and speedier foes, but Durant's main purpose it's sending out the booster and start momentum.)

Despite there are some sturdy variants that may bring up this strategy too... They are all pretty slow and Durant's typing also helps covering some of my team's weaknesses.

DRAMPA:

Drampa (M) @ Focus Sash
EVs: 252 SpA (others irrelevant)
Ability: Berserk 
Modest Nature 
- Draco Meteor 
- Heat Wave 
- Hyper Voice
- Endeavor (filler)

Just switch after a partner faints and let it take a hit and get a Berserk boost. With that boost + 135 SpA retaliate with the best move and faint the foe. Endeavor is for filling... Didn't find any other worthy moves. The problem is those Quiver dance and Calm mind boosters...so I actually prefer the first Durant strategy.

I'm missing something? Are these good ways of countering overboosted foes?

Comments

This is for competitive, right? What format?

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I'd say Phazing, hazing, Taunt, and even Snatch are all more reliable :P

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No idea, the format where that would be the best answer to boosted swerpers...

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Well, there's the first learning to come of this. Try to avoid making movesets without a specific metagame or format in mind. Movesets need to respond to what Pokemon are popular and what strategies work, and that dynamic can change a lot between different game modes.
If for argument's sake we assume a 'normal' format like OU or BSS, neither Drampa nor Durant are viable picks to begin with, so there's that limitation as well.

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Another important reason why they're both bad is that both of these strategies can be used once per battle. In most formats, the best ways to stop setup sweepers are strong Pokemon with priority attacks, fast Pokemon with strong attacks, or bulky Pokemon with a lot of resistances and stat-change-resetting moves. Of course, the specific Pokemon and moves used depend on the format.

Answer 1

The asker asked for whichever format where those Pokemon would be the best answer to sweepers and never said the format needed to be popular, so I'm going to make up a new format. This format is singles, and only these 3 sets are allowed.

Sunkern @ Toxic Orb
Ability: Solar Power
Adamant Nature
- Growth
- Absorb

Durant (M) @ Red Card
Ability: Swarm
EVs: 6 HP / 252 Atk / 252 Spe
Jolly Nature
- Endure
- Endeavor
- X-Scissor
- Iron Head

Drampa (M) @ Focus Sash
Ability: Berserk
EVs: 252 SpA
Modest Nature
- Draco Meteor
- Heat Wave
- Hyper Voice
- Endeavor

In this metagame, the only setup sweeper is the Sunkern. To stop that Sunkern, using Durant or Drampa would be better than using your own Sunkern, so they are the best answers to Sunkern.