Rival one is amicable with

• Reggie, to Archie, in Archie Comics
• Fake chum
• False ally
• Supporter to keep a watchful eye on
• Ally who's not completely an ally
• Buddy to be wary of
• Faux ally
• Bud that you're not always high on?
• Good bud who may be regarded with some suspicion

Wikipedia Word definitions in Wikipedia
"Frenemy" (less commonly spelled " frienemy ") is an oxymoron and a portmanteau of " friend " and " enemy " that can refer to either an enemy pretending to be a friend or someone who really is a friend but also a rival . The term is used to describe personal, ...