Gyaradisc's small stature does nothing to curb its violent and aggressive tendencies. It's given a wide berth due to superstition that those bitten by Gyaradisc will lose the ability to feel love, replaced with rage.
Gyaradisc is infamous for its violent courtship. To impress a potential partner, Gyaradisc will destroy large swathes of reef. The most destructive individual is deemed the most desirable.