*replays Chrono Trigger*

It's very important to take out the side things to avoid Delta Attack. Each one dies after maybe a round of attacks so focus on one... then the other. It will now give you 5 turns to pound away before it revives the other. Marle should heal when you have spare turns and help inflict damage on the side bots. Lucca's flame moves are helpful but she's not too important- keep attacking. Chrono can deal the most damage, if you have some spare MP (I don't like to Aura Whirl in this fight because Marle can heal during the 5 spare turns but it's helpful) cyclone does a nice amount of damage. Just remember that once the bots are dead it does nothing for 5 turns, making it another easy boss.