The Rat is an enemy in Chrono Trigger that first appears in Arris Dome in 2300 AD.
The rats appear in non-combat in Site 16, although they steal Potions from you. There is also a Rat in the Arris Dome, you need to catch it to know the password to the door to the supercomputer. (That's how you find out about Lavos)
Gallery
Bestiary entry (DS)
"Attributes" tab
"Elements" tab
"Techs" tab