| Grick |
Claw—contact (curse); save Fort DC
is how this ability is formatted .... I am assuming that that means the curse can only be transmitted via claw
Curse (Su): "A creature with this ability bestows a curse upon its enemies. The effects of the curse, including its save, frequency, and cure, are included in the creature's description. If a curse allows a saving throw, it is usually a Will save (DC 10 + 1/2 cursing creature's racial HD + creature's Cha modifier; the exact DC is given in the creature's descriptive text). Curses can be removed through remove curse and similar effects.
Format: Curse Name (Su) Slam—contact; save Will DC 14, frequency 1 day, effect 1d4 Str drain; Location: Special Attacks and individual attacks."
In order for the creature to curse someone, it must hit with a claw attack. Then the character makes a save. If they fail the save, they are cursed, and then abide by the frequency/effect/etc.
You should be able to grapple it all you like, as long as it doesn't claw you.