This boss battle consists of 6 R-Series robots that look like Robo. Only problem is that Robo won't be with you for this fight.
All six of them are easy so it's best to use a move like the Fire Whirl dual tech to take down each group of three. It takes two of them to take each group of 3 down. Only problem is the fact that they can gang up on you and do heavy damage but if you can persevere, you'll do fine.
Afterwards, you'll see a cutscene where Lucca repairs Robo and the four of them leave Proto Dome only to end up at the End of Time.
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The R Series of robots are enemies found in 2300 A.D. in Chrono Trigger. Collectively, they are...