Explore Lulukoko, Tsukuyusa, and Westown in this multi-cultural farming game for Nintendo 3DS. [ Game Guide ] JP release = Jun 2016. NA release = Feb 2017. EU release = Oct 2017.
Well if there is a way to obtain Coffee (foraging) then yes, there should be a way to make 5* packs...if not, then...I don't think so.
Not sure on the Pets, since my Pet is an Ore finder.
Poison mushrooms are supposed to appear in the ruins on rainy days but I haven't seen any yet. If you mean treasure hunt I don't think you can find them that way.