Ride Watches (Prime Reality)

The Ride Watches (ライドウォッチ) are pocketwatch-like devices used by the Riders in Kamen Rider Zi-O that contain the power of past Kamen Riders.

Overview
Ride Watches are armament devices designed like stopwatches that are the power sources for Ride Watch-compatible Rider Systems. Once created, they infuse the previous Kamen Rider's powers along with their memories as well as the history of their monsters as well.

Ride Watch Creation

 * 1) Confirm that an Another Rider exists during the present day.
 * 2) Meet the Rider in present day on which the Another Rider is based.
 * 3) The veteran Rider will return the Ride Watch to the user and ask them to protect their wishes.
 * 4) Return to the past and defeat the Another Rider.
 * 5) Give the veteran Rider(s) a blank Ride Watch, in which they will later manifest when the user returns to the present day to receive them in Step 3. This is the start of a bootstrap paradox in which the veteran Riders lose their memories from this point on and will temporarily regain them as Sougo approaches them in 2018.
 * 6) *According to Woz's opening narration in episode 2, the Ride Watches actually "steal" the powers of past Riders along with their entire existence as Riders from time. This presents a sinister aspect to their creation, as Riders lose their memories and powers upon Zi-O or Geiz's first activation of the respective RideArmor.
 * 7) **In episode 5, it is revealed that Ride Watches not just steal the history of Riders, but also their villains, effectively erasing all conflict from time and preventing a much more imminent bad future from forming. However, the degree of change varies from Rider to Rider, due to the villains in most Kamen Rider series having origins independent of that of the Kamen Rider who eventually faces them, though evidence of their prior existence and impact are still being seen in the altered present.

Portrayal
The Ridewatches are voiced by Rikiya Koyama (小山 力也), who previously voiced Paradox Roidmude in Kamen Rider Drive: Surprise Future, Kamen Rider Bujin Gaim in Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle and physically portrayed Joe the Haze in Kamen Rider Black RX. He also voiced other equipment in Kamen Rider Zi-O. The singing portions of the Ridewatches' transformation announcements are voiced by Yohei Onishi (大西 洋平).

The transformation announcements of Legend Rider Ridewatches also recycle audio from the original Riders' transformation announcements, voiced by other Rider Equipment Voice Actors.
 * The BuildArmor's transformation announcement reuses the Build Driver's "Best Match" announcement voiced by KORBY.
 * The Cross-Z Ridewatch reuses the "Wake up burning!" portion of the Cross-Z Dragon's transformation announcement.
 * The Ex-AidArmor and GenmArmor's transformation announcements reuse the Rider Gashats' "Level up!" announcement, voiced by Hironobu Kageyama.
 * The DriveArmor's transformation announcement reuses the Drive Driver's "Drive!" announcement, voiced by Chris Peppler.
 * The GaimArmor transformation announcements reuses the Sengoku Driver's "Seiya!" announcement, voiced by Seiji Hiratoko.


 * The BladeArmor's transformation announcement reuses the Blay Buckle's "Turn Up!" announcement, voiced by Takeshi Sasaki.
 * The FaizArmor's transformation announcement reuses the Faiz Phone's "Complete!" announcement, voiced by Takehiko Kano.