Pellechrome

Pellechrome is a city on Cybertron which took a long time to construct.

Fiction

2015 Robots in Disguise cartoon

When Denny Clay complained that Fixit was taking too long to fix things, Fixit told him Pellechrome wasn't built in a millennium. Rumble in the Jungle

In the Realm of the Primes, Micronus told Optimus Prime that Pellechrome wasn't built in a millennium. The Trials of Optimus Prime