EX:
Friend 1 (owner) Has foreign ditto and has 5 others let's say zangoose, fidough, oricorio, fuecoco, and quaxily are the pokemon you are hunting. Only the owner can have 6 pokemon because of the party limit.
Friend 2 (not the owner) Can only bring one pokemon let's say ralts without everstone.
Friend 3 (not the owner) Can only bring one pokemon let's say psyduck withoiut everstone
I recommend only using 3 because we also found a way to get egg 3 with a 3-person picnic. This recipie is 1 lettuce, 1 Red onion, 1 tofu, 1 salty herba, 1 sweet herba, and 1 salt for the final person. But you an use 4 but i do not have a recipe for that.
You can use other pokemon other than the pokemon mentioned as long as they can be breeded into eggs they are fine so no legendaries, no paradox, and no other pokemon that cant come from eggs, and no pokemon from other gens unless they in the dex.
Credits to Sir_Lord_Chimchar_The_Gr8 on twitch for discovering this with me and Traineroblivioyt also on twitch