PK Ground

From Mother - Wiki on Neoseeker

PK Ground is the last PSI spell Kumatora is able to learn. It can be the second last, if enough grinding is done before she learns PK Starstorm.

PK Ground is similar to PK Thunder. It can break through PSI Shields, and it also causes harm to all enemies. It hits the enemy party eight times, hitting a random enemy for eight times total. Because of this, it is extremely similar to PK Thunder Ω, save for the fact that it hits each enemy twice as much. It could be called the fifth PK Thunder, despite not being of the thunder attribute. It's also the strongest against bosses. It does 10% of the enemy's damage every time it hits, so it can pack a wallop.