In the Battle Maison, one of the things you can trade your battle points for is an item called the "Weakness Policy." Now I get that if the pokemon that is holding the item gets hit by a super effective move and survives it, that pokemon gets an increase of Attack and Special Attack stats. However Seribii says it increases by "2 stages." Is that immediate? Ummm .... what does that mean to me and my pokemon? What is a stage? I'm sure it could be quite useful if it's a more than single use hold item - especially on a pokemon with the ability "Sturdy." Usually those pokes are quite slow, so if it's immediate, the effect could be quite useful as a retaliatory strike.