Lean, mean fighting machines can classify some of the bosses in Chrono Trigger, but all of them can be classified as tough.  HP counts are approximated because Lucca's Sightscope can't read bosses.  Besides a picture of the boss and recommended team to face it, you can find out its location, time period, HP, Main attacks, Major Weaknesses, and a mini guide for handling the boss.
Boss Name: Golem Twins
Recommended Team: Crono, Robo, and Anyone except Ayla (unless you are Charming)
Time Period/Location: 12,000 BC/Undersea Palace
Hit Points: 10,000 HP Each
EXP/Tech Points/Gold: 2000/70/4000
Main Attacks: Iron Orb, Copy Spells, Blurrp!
Major Weaknesses: Powerful Spells that hit both Golems
Mini Guide: The Golem Twins are similar to the solo Golem you faced as well as Dalton, except they have more HP.  Again, Lightning 2, Luminaire, Laser Spin, Antipode 2, Ice 2, Fire 2, and any other attacks that can hit both of them do well.  Physical attacks again will be countered by Iron Orb, so don't use them!  If you want to try to conserve MP, focus on eliminating one of the Twins, but keep your HP up with Heal Beam because they have the final attack Blurrp! 
Vs.
Vs.
Vs.
Characters-    #1     #2           #3
Characters-    #1     #2         #3
Characters- #1      #2        #3
Any Except Ayla
Any Except Ayla
Any except Ayla
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