Counterguard

Counterguard (ガードカウンター) or also known as Counterattack is an ability available in Kingdom Hearts, Kingdom Hearts II and Kingdom Hearts 358/2 Days.

Kingdom Hearts
In Kingdom Hearts, the ability is known by Counterattack. When Sora's ground attack is deflected, pressing again will make him instantly slash forward to start another combo. A successful Counterattack will increase MP Charge.

Kingdom Hearts II
The ability allows Sora to counterattack nearby enemies with a shock wave after performing a successful Guard. The ability costs 4 AP.

Kingdom Hearts 358/2 Days
It needs to be linked to a Block panel to work. This ability lets you counter your opponent with a combo after you pull off a successful block. This counter attack is always a critical hit and can do more damage than a normal combo.