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Description
The Heisei Kamen Riders have passed through this era! Now it's time to pass that power down to the future! Rejoice! The birth of the new king! GrandZi-O!

GrandZi-O Ridewatch (グランドジオウライドウォッチ GurandoJiō Raidowotchi)[4] : Used by Zi-O to access his final form, GrandZi-O. It is labeled as New and dated 2019, but shown on the Ziku-Driver's screen as 0000.

It originally manifested once Sougo collected all the Legend Watches but disappeared after Momotaros took the Den-O Watch back. The Watch later returned after Momotaros gave the Den-O Watch to Sougo again and the GrandZi-O Watch returned once more.

As a result of the Ridewatches' destruction and Sougo returning the Decade Ridewatch back to Tsukasa, the GrandZi-O Watch would be temporarily erased again until Sougo's final battle with Swartz.

Description
The Heisei Kamen Riders have passed through this era! Now it's time to pass that power down to the future! Rejoice! The birth of the new king! GrandZi-O!

GrandZi-O Ridewatch (グランドジオウライドウォッチ GurandoJiō Raidowotchi)[4] : Used by Zi-O to access his final form, GrandZi-O. It is labeled as New and dated 2019, but shown on the Ziku-Driver's screen as 0000.

It originally manifested once Sougo collected all the Legend Watches but disappeared after Momotaros took the Den-O Watch back. The Watch later returned after Momotaros gave the Den-O Watch to Sougo again and the GrandZi-O Watch returned once more.

As a result of the Ridewatches' destruction and Sougo returning the Decade Ridewatch back to Tsukasa, the GrandZi-O Watch would be temporarily erased again until Sougo's final battle with Swartz.