From the Super Mario Wiki
Monstro Town is a cliff-side town in Super Mario RPG: Legend of the Seven Stars. It is accessible after successfully clearing Belome Temple. It is home to a mixed group of reformed monsters as well as a Toad woman by the name of Monstermama. Jinx, along with his student Jagger run the dojo, where they willingly accept challenges.
Of the notable monsters, there is a Chow who keeps track of the number of Super Jumps Mario has performed, and who will award prizes at 30 and 100 consecutive Super Jumps. There is also a Chester who tells Mario how many invisible chests are left to be found, and a Starslap who dances to a tune (which is the third song for Toadofsky at Melody Bay).
Also of notice is the visitor from Vanda; Culex, whom is often considered the hardest (albeit optional) boss in the game. Culex can be encountered by using a Shiny Stone (traded in Moleville for a Fireworks) on the sealed door.
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