Kamen Rider Gaim Ichigo Arms!

From Jefusion:

A Rider Created by the Badan Empire named Kamen Rider Fifteen has the ability to use Lock Seeds which are based on the Heisei Era Riders. He then uses the Heisei Rider Lock Seed to transform into Kamen Rider Fifteen Gaim Arms. To counter this, Kamen Rider Gaim uses the Showa Rider Lock Seed to transform into Kamen Rider Gaim #1 Arms!