6th Singularity Camelot: Roayl Castle free quest is the best AP & time saving location to farm Medal of Great Knight. You'll get about 3-4x Medal of Great Knight by spending 210AP.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
Best Servants [★4]: 4 Star Tier List
Anne Bonny & Mary Read (Rider)
Berserker - Craft Essences
Ushiwakamaru
Altria Pendragon (Lily)
Passionlip
Chaldean S.I.U.
Ereshkigal
Arthur Pendragon(Prototype)
Gorgon
Black Holy Grail (The Black Grail)