Zoids: Chaotic Century(1999)

Zoids: Chaotic Century is an anime series set on the distant planet Zi, where biomechanical creatures called Zoids dominate warfare between the Helic Republic and the Guylos Empire. A fragile ceasefire fractures as ancient Zoidian technology resurfaces, threatening renewed conflict. Young Van Flyheight discovers Fiona, an amnesiac girl, alongside Zeke, an Organoid that amplifies Zoid combat power. Together with the pragmatic Moonbay and mercenary Irvine, Van embarks on a cross-continental journey to uncover Fiona's origins. As the group travels deeper into the Republic's territory, they become entangled in escalating tensions that could reshape Zi's political landscape and reignite total war between the rival nations.