What does a golden seed do in Pokemon Mystery Dungeon 2?

The Pokemon that eats it gets it's Level boosted by 5. It is impossible to sell.

Here are four codes you can put on wonder mail s passWord for a Golden Seed

1FM67 @X7=#&& 4S5Q5

CFXSX -R68R4H N#3WH

XR6R# 210SMW0 &@19R

SCX5W 787PN4J @0K-2

%X=Q0 P1W9P0& %SN27

YCQ#Q 5T8R6HW P9XJ8

F9J=S #68@&N- PNT#&

1@QK- %&F6%%- 9%P9&

They are all at drenched bluff and they are really easy.