FusionDex

The blade of Doubtly is made from its spectral gas, and because of this, it will dissipate after continuous use. As it continues to reforge its blade, it will become stronger and eventually allow Doubtly to evolve to a more solid form.

When exposed to a strong wind, a Doubtly's gaseous body quickly dwindles away. The complex attack patterns of its two swords are unstoppable, even for an opponent greatly accomplished at swordplay.