Yammar Option

Yammar Option (ヤンマーオプション) is a Special Weapon obtainable in Mega Man X6 by defeating Commander Yammark. When equipped with this weapon, X (or Zero) creates three dragonflies around him, costing 3 uses. These dragonflies can fire green energy shots if you press the Triangle Button (and the Square button in addition for Zero). The dragonflies can also physically inflict damage on the opponent for a limited time. If they take too many hits, they are destroyed. It costs one use of the weapon for each dragonfly you have to replace.

When X charges this weapon, he creates three flashing yellow dragonflies around him, and they shoot yellow energy shots automatically in random directions. This goes on for approximately 10-15 seconds, then it stops and you will have three normal dragonflies. The dragonflies cannot be destroyed while the charged weapon is in effect, and they will fire their yellow energy shots 24 times before they turn normal. After you use the charged weapons, if you charge it up again, you can actually redo the charged shot for one use of the normal weapon plus one use of the normal weapon for each dragonfly that needs to be replaced.

This weapon is Ground Scaravich's primary weakness, doing 5 units of damage to him (from both energy shots, and contact with the dragonflies) when X and Zero use this weapon, and 8 units of damage when X uses this weapon in its charged state (from both energy shots, and contact with the dragonflies). 

Trivia

 * Interestingly, Yammar Option is the only weapon that can destroy the Nightmare Insects in Commander Yammark's stage; any other weapons will otherwise cause them to regenerate.
 * Nightmare Bugs are also another Nightmare phenomenon that can only be destroyed with Yammar Option.
 * Interestingly, in the beta version of Mega Man X6, Illumina had a primary weakness to this weapon before it changed to Meteor Rain in the finish product. The reason for this change is unknown.