Seeing him come into his own is enough to show you why he earned the role of Senior Caretaker. In the altered timeline Azimuth manages to beat him before Ratchet and Clank can arrive, but it's still a satisfying moment considering how he spent half the game hiding from both danger and his own inner sadness over Orvus' disappearance.
Ratchet's spent the entire adventure trying to learn more about his race in the hopes of possibly reuniting with them, and Tachyon taunts him with this by opening a portal to the Lombax dimension, sadistically offering him a choice between rejoining them or staying in his universe and remaining the only Lombax, possibly forever. "Incredible" doesn't even begin to describe it. Starts with an ambush by Pirate Fighters, followed by Ratchet piloting Aphelion through a Pirate outpost on an icy asteroid (And destroying it, too!) and ending with a boss fight as you pilot through a black hole.