Min. number of people needed to visit Pink Bean?

I did this quest:

First attempt) Strolled inside to the map before Pink Been, was told to gather three 140 level or above characters
Second attempt) Gathers enough items and people to enter the map a second time, registers an expedition party and is now told that I need six people (level limit unknown)

pineapple third attempt. Spent ten million mesos, four smegas and ten pineappleing hours trying to beat this quest; I could've bought a giant frog wallet or dropped a piece of friendship instead. Total waste of time and money

Interesting to know JMS and GMS are that different. I did it here, 1 person (lvl 170) with me and one (lvl 14X) elsewhere, all in the PB squad made from squad menu. So it was not the info I gave that was wrong, it was just incompatible with JMS. xP