Board Thread:Questions and Answers/@comment-25344119-20140824175647/@comment-24145588-20140824190335

Single-element monsters are added to your island by buying their eggs, or winning them on the weely  Scratch Ticket from the Nursery. In your case, to get the Water element, you'll need to buy/win a Toe Jammer egg. (Buying is much more practical, unless you happen to have the ticket available right that moment.)

For information on breeding the Shugabush or any other Legendary Monsters, see the appropriate pages in the wiki.