Level 15

15 (レベル15), often abbreviated as LV15, is the of the Ex-Aid Riders, which is accessed through the use of a second  at the same time as their normal Gashat, summoning a  known as a  and combining with it. Despite not usually looking greatly different from Level 2, Level 15 forms are far superior in base stats.

Level 15 can be accessed by a Rider activating the second Gashat, closing the 's cover (as a second Gashat is active,  is not retaken), inserting the Gashat, and then opening the cover again. It is also shown that Level 15 can be taken directly from Level 1 or an untransformed state by inserting the second Gashat before first opening the Driver cover. At this time, Level 15 can only be accessed through the use of Mighty Action X SP

It is currently unknown if Bugsters can also achieve this level..