User blog comment:Blademaster00/Official Amatsumagatsuchi Talk Page/@comment-2040723-20101206154035/@comment-2040723-20101206220547

EDIT: I looked the skills up on the Minegarde forums, and they are as follows:

Gold Rathian: Luck Booster, Ruiner(no idea what this does), Divine Protection, Thunder Resistance Down

Silver Rathalos: Attack Up Small, Sharp Sword, Weakening Effect (never heard of this either), Health -10

Deviljho (Vangis): Sharpness+1, Speed Eating+2, Blunt (lame!)

Jhen Mohran: ESP, Reckless Abandon +2, Focus, Recovery Speed -1

Akantor: High Grade Earplugs, Ruiner, Fire Element +1, Demonic Protection

Ukanlos: Ice Element +1, Weakening Effect, ESP

Alatreon (Escadora): Evasion Up, Negate Damage Attribute (Blightproof?), Element Attack Up, Worry

Amatsumagatsuchi: Unleashed Power +2 (related to Awaken, perhaps?), Sharpness +1, Water Element +1, Slow Life (animation for item use takes more time)

Jolly Roger: Carving Expert, Adrenaline +1, Good Luck, Demonic Protection

Looks like Amatsu's armor is definitely worth grinding for- Sharpness+1 is always better without Blunt Edge and the huge nerf that the Vangis armor took pretty much makes it an inferior version of the Helios/Selene armor.