To find the Grimalkin the player must have spoken to the "Huntmaster" in Phon Coast and defeated Thalassinon, which will trigger the start of the Rare Game quest. Grimalkin then has a 10% chance of replacing one of the Coeurls in the Uazcuff Hills area of the Tchita Uplands. Zoning out two areas (most easily done by going east to the Cerobi Steppe) and checking each Coeurl for the spawn is necessary every trip.
[view·edit·purge]A grimalkin is an old or evil-looking female cat. The term stems from "grey" (the color) plus "malkin", an archaic term with several meanings (a cat, a low class woman, a weakling, a mop) derived from a hypocoristic form of the female name Maud. Scottish legend refers to the grimalkin as a faery cat that dwells in the highlands.
Grimalkin was also the name of the witches' cat familiar in Macbeth by William Shakespeare. The term may derive from Beware the Cat (published 1570) by William Baldwin.