Rx-xR

Rx-xR can be found in Lab 32 in 2300 A.D. in Chrono Trigger. He is a robot and the Race Log Keeper. He records the player's top race scores when the player decides to race Johnny, but only if Crono has the Race Log in his possession.

Beyond the Ruins
After Crono finds the Race Log in Lab 32, Rx-xR begins to record all the highest race scores for Crono.