Innocence Ability

Name: Innocence
Effect: Decrease the attack of the opponent by 1 stage.
Secondary Effect: None
Description: The innocence of the Pokemon makes the attacking pokemon hold back, and decreases it's attack. The ability is activated the first time the opponent attacks, and then isnt activated again until a different pokemon attacks it.
Looks: The pokemon looks very cute
Type: Special
Pokemon:
Pruddy
Eevee
Skitty
Togepi

How would the ability be activated?

The ability is activated the first time the opponent attacks, and then isnt activated again until a different pokemon attacks it.

Could you please add that to the description then? ^^

The type would be special i think

Edited

Approved unless stated otherwise.