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: Masa and Mune/Masamune
Recommended Team: Crono, Lucca, and Marle (Both)
Time Period/Location:
600 AD/Denadoro Mountains
Hit Points:
Masa and Mune- 1000 HP Each/Masamune- 3600 HP
EXP/Tech Points/Gold:
400/4/400; 500/10/1500
Main Attacks
: Masa and Mune- X-Strike; Masamune- Fists, Slash
Major Weaknesses:
Masamune- Slash (when Charging up)
Mini Guide
: Masa and Mune throw off their disguises when it comes clear that you want the Legendary Masamune Sword.  These two aren't too tough individually, but they have an X-Strike Attack that can be pretty painful.  Focus your attacks on either Masa or Mune and the battle will shift once you deal one of them 1000 HP of damage.  Masa and Mune will then combine to form the much more powerful Masamune.  Masamune is much stronger and has much more HP.  When Masamune begins charging up wind power, use Crono's Slash attack to stop the charging.  Keep your party's HP up and use Physical Attacks and Magic to defeat the huge beast.
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Characters-    #1           #2          #3
Characters-    #1            #2        #3
Characters-    #1           #2        #3
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