Counter

From Mother - Wiki on Neoseeker

Counter will allow you to take the damage reduced by half, then reflect the full damage back at the enemy. This move is usually only helpful against enemies with physical attacks.

Usage

This move is used for people who want to use Physical Attacks.

Mother 2

Ness and Poo learn Shield, which acts as Counter in the beta and omega forms. Poo can utilize both forms, while Ness can only use the beta form.

Mother 3

Lucas learns Counter in both alpha and omega forms. It's use is the same.