The Tarasque appears in the Garden of Life's Circle area of the Tchita Uplands. For it to appear, the player must Chain kill at least 22 Serpents or Malboro Overkings while in the Uplands.
The easiest way to do this is to circle around the Garden of Life, killing all the Serpents (leaving the Lizard alone), then move two areas away (through Nameless Spring without saving the game, then north to Oliphzak Rise, then back again) to respawn the Serpents. After chaining the kills, the player can walk near the pond at the northern end of the area, next to the Lizard, and the Tarasque should jump out.
[view·edit·purge]According to Christian legend, the Tarasque was a giant sea serpent with a lion's head, turtle shell, and scorpion tail that terrorized France. Saint Martha charmed the Tarasque and led it to a town, where the townspeople killed it. The Tarasque offered no resistance.