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: Flea
Recommended Team: Crono, Frog, and Robo/Marle
Time Period/Location:
600 AD/Magus Castle
Hit Points:
Flea???- 1 HP/Flea- 4120 HP
EXP/Tech Points/Gold:
500/10/1000
Main Attacks
: Flea Stare, Poison
Major Weaknesses:
X-Strike
Mini Guide
: The first form is not the true form of Flea, but only casts MP Buster on the character that hits it, so you are going to need to use Mid Ethers on the character during your fight with the real Flea.  Flea relies on you do to most of the damage to your own party by casting Chaos and Poison spells on your party.  Make sure you have plenty of Heals to combat this sorceress.  Physical Attacks work well, as does X-Strike.  Do about 4200 damage to Flea and she will be defeated. 
Vs.
Vs.
Vs.
Characters-    #1         #2           #3
Characters-    #1       #2         #3
OR
OR
OR
Characters-    #1       #2         #3
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