Since there is not a drop list on the website, I will be making one here. If anything is missing, post a reply and I will add it.
Courtesy of Star guild.
Armors:
G50 - d1, d2, d3, d5
G55 - d5, emok defenders
G60 - emok defenders, TOP, Hell Island
G65 - Hell Dungeons, 80+ areas
Weapons:
G50 through g56 - d1, d2, d3, d5
G59 - d3, d5, emok warriors
G62 - emok warriors
G65 - Hell Dungeons, 80+ areas
G70 - Doggebi Lord
Other:
Gold Coin: all
Power and Cyber cards drop respectively with their armor values.
This is just a general list for now, help me add and refine it.