Eject Button

Eject Buttonだっしゅつボタン
Information
Introduced in	Generation V
Type	Hold
Buying price	Cannot be bought
Selling price	2,000
Descriptions
Generation V	If the holder is hit by an attack, it will switch with another Pokémon in your party.
Generation VI	An item to be held by a Pokémon. If the holder is hit by an attack, it will be switched out of battle.

The Eject Button (Japanese: だっしゅつボタン, Hepburn: Escape Button) is an in-battle effect item that was introduced in Generation V. The Eject Button, which can only be used once, switches the holder out of battle immediately after it is attacked. It can be bought for 32BP at the Battle Subway.

Locations

Omega Ruby and Alpha Sapphire: It can be bought in the Battle Resort.