May 1, 2015, 02:00 PM
I'll quote the answer from a recent report on Nugget Bridge (http://nuggetbridge.com/articles/differe...s-pokemon/)
Hazards Aren’t Great
Stealth Rock, Spikes, Toxic Spikes, and Sticky Web are less effective in Double Battles than in Single Battles. Double Battles are shorter, which means fewer switchins. Also, switching isn’t as necessary to outplay your opponent. Using a hazard move is perceived as wasting a turn that could have been spent attacking or disabling enemy Pokémon. No hazard move has been used successfully at any high level of VGC.
Hazards Aren’t Great
Stealth Rock, Spikes, Toxic Spikes, and Sticky Web are less effective in Double Battles than in Single Battles. Double Battles are shorter, which means fewer switchins. Also, switching isn’t as necessary to outplay your opponent. Using a hazard move is perceived as wasting a turn that could have been spent attacking or disabling enemy Pokémon. No hazard move has been used successfully at any high level of VGC.