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Opposing grounded Pokemon cannot switch out while the wielder is on the field. Grounded Pokemon are those that are not part Flying-type, do not have the ability Levitate, do not have Magnet Rise active, and are not holding an Air Balloon. If Gravity is active, all Pokemon are grounded. All Pokemon holding an Iron Ball are grounded, as are Pokemon under the effect of Ingrain (although they can't manually switch out anyway). A grounded Pokemon can escape by using Baton Pass, U-turn, or Volt Switch (as long as the wielder isn't immune to Volt Switch), or by holding the item Shed Shell. Arena Trap does not prevent the effect of Eject Button.
When the wielder is first in the party, the chance of wild encounters occurring is increased.
This ability is incredibly useful. Its very low distribution has only increased its niche. Three Pokemon have access to Arena Trap. Diglett is used in LC, whilst its evolution, Dugtrio, can often be seen in the upper tiers. Sometimes, Dugtrio even makes an appearance in Ubers due to its ability to trap Pokemon locked into Thunder or another Electric-type attack, and then dispatch them swiftly with a STAB Earthquake. This makes Dugtrio the perfect revenge killer, more or less guaranteeing the removal of a problem Pokemon, but Dugtrio does have a tendency to become set-up fodder afterwards.
Found in Dream World