From BG FFXI Wiki

Linkshell Concierges are NPCs that match linkshells looking for players with players looking for linkshells. Each one holds a different inventory of linkshells.

Any player with a linkshell or pearlsack may give linkpearls to the concierge to hand out. Players looking for a linkshell may then elect to receive one such linkpearl of their choosing.

Linkshell concierge locations and the style of linkshell they are in charge of are as follows.