What is the purpose of the pig at the hub?
Solution 1:
If you press X on PS4 or A on Xbox One when the exclamation mark appears, the Poogie will do a happy dance and grunt in approval. This increases the chances of obtaining rare items from quests can be repeated multiple time until eventually Poogie will befriend you.
Once you're Poogie's friend, you can pick him up and carry him around, change his costumes, and change his name. While carrying Poogie around, certain places will make the controller rumble. If you put Poogie down at these spots, he will dig an item out for you.