To get it first you need three bones:
Blue: Can be obtained from the mine
Green: Can be obtained from the mine
Red: Can be bought at Costolot´s
And you also need an ambar that can be gotten
from the wishing well by throwing it 9999 chocolate
coins or buying it at Costolot´s after watching the
credits from the main menu.
After you get these four items you need to place
them in a store house.
Depending on the color and the order you place the
bones is the type of piñata you get:
Skull- Type of head
Ribs- Type of tail
Red- Flat, seven spiked club
Blue- Pointed tail,four long spikes
Green- Tail fan
Spine- Type of color
After you place them in the store house they will fuse
into an egg. You need a cluckles with a jurassic hair wig
to hatch it.To fully mature it you need to feed it a bottle
of milk, a bone, a geckie, a cocoadile and a jameleon.
gamefaqs.com - greenyoshi067