Chrono tigger robo
Robo is a robot found in disrepair in 2300 AD after Chrono, Marle and Lucca run from the Chancellor and end up in the future.  Lucca repairs him and he joins the group in a hunt to restore power to the dome.  They successfully restore the power but on the way back run into robots of the same series of Robo, who beat him up and discard him.  After Crono and his partner defeat the R-Series, they retrieve Robo and repair him before entering the gate.