From Henshin Justice:
The one who transforms into KyoryuGold is a swordsman from 400 years
called Maru Utsusemi, played by Atsushi Maruyama. He fought alongside
Torin against evil Devoss Army during the Sengoku era. He ended up being
sealed inside his rival, Dogold, during their fight. As it turns out,
Dogold is actually an armor with its own will. As he is released, he
swears to destroy the Devoss Army.
KyoryuGold’s weapon is a sword called Zunder Thunder. With 3 batteries, he can activate his special attack, “Mysterious Lightning Afterglow” His partner is Pteragodon, who turned evil while Maru Utsusemi was gone.