Zero gains an EX Skill from a boss if his rank is at least A when he defeats it. Keep in mind, it's his rank upon beginning the mission that counts, not the rank he gets at the end of the mission (which counts for the next boss). These can be equipped and unequipped from the subscreen.
Buster Skills
Laser Shot
- Obtained from: Hyleg Ourobockle
When no element chip is equipped, Zero's charged buster shot becomes a laser that can penetrate enemy defenses.
Triple Shot
- Obtained from: Poler Kamrous
When the Ice chip is equipped, Zero's charged buster shot splits into three ice shots upon contact with an enemy.
Spark Shot
- Obtained from: Panter Flauclaws
When the Thunder chip is equipped, Zero's charged buster shot splits into two electric shots that travel up and down upon contact with an enemy.
Blast Shot
- Obtained from: Fighting Fefnir
When the Flame chip is equipped, Zero's charged buster shot explodes and does more damage upon contact with an enemy.
Saber Skills
Tenshouzan
- Obtained from: Phoenix Magnion
Press 
+ Saber on the ground. Zero performs a rising uppercut with the Saber. If the Flame chip is equipped, the attack becomes a Flame element and goes higher.
Sengatotsu
- Obtained from: Kuwagust Anchus
Press Saber while dashing. Zero thrusts the Saber forward. If the Thunder chip is equipped, the attack becomes a Thunder element.
Sharp Edge
- Obtained from: Fairy Leviathan
Press 
+ Saber in the air. Zero stabs downward with the Saber. If the Ice chip is equipped, the attack becomes an Ice element.
Kougenjin
- Obtained from: Sage Harpuia
Press + Saber on the ground. Zero slashes sideways and fires an energy wave that travels a short distance forward.
Chain Rod Skills
Energy Chain
- Obtained from: Burble Hekelot
Latch onto an enemy with the Chain Rod and just hold on. After a few seconds, Zero starts leeching away the enemy's HP to restore his own. If Zero's HP is full, this will fill his Sub Tanks.
Shield Skills
Filter Shield
- Obtained from: Rainbow Devil MK2
Throw the Shield Boomerang just before an enemy shot hits, and it turns the shot into an E-Crystal.