Uh oh! Looks like you're trying to cross the path of the Dark Guardian. He hasn't let anyone in his cave for many years.
Many believe he protects lost minis, who trust him to find good owners for eggs they lay but cannot take care of themselves.
Items you can gain from this quest:

Evolutions Puzzle Piece 2

Evolutions Puzzle Piece 3

Evolutions Puzzle Piece 4

Evolutions Puzzle Piece 5

Evolutions Puzzle Piece 6

Evolutions Puzzle Piece 7

Evolutions Puzzle Piece 8

Evolutions Puzzle Piece 9

Evolutions Puzzle Piece 10

Evolutions Puzzle Piece 11

Evolutions Puzzle Piece 12

Evolutions Puzzle Piece 1