The Moon Social Link is quite infamous among Persona 3 fans, but just like the rest of the content, it was vastly improved in the Reload version. There are still tons of reasons to dislike Suemitsu, but he’s an important Link nonetheless.
Persona 3 Reload Moon Social Link Guide (P3R)
The Moon Social Link in Persona 3 Reload is represented by Nozomi Suemitsu, the Gourmet King. You can unlock it after reaching Magician Rank 3 and increasing your Charm to at least Level 2 (Unpolished), then visiting him at the Paulownia Mall. You must then correctly answer his Gourmet Quiz and deliver him an Odd Morsel, which finally unlocks his Link.