Encounter Plus (エンカウントアップ, Enkaunto Appu?, lit. "Encounter Up") is an ability that appears in Kingdom Hearts Final Mix. It increases the rate of spawning and encountering Heartless.
In Kingdom Hearts Final Mix, Encounter Plus is a support ability that costs 1 AP to equip.
The Teeming Darkness map card, in Kingdom Hearts Chain of Memories, has a similar effect.