To breed a Shuggabush all you need to do is breed a congle and a bowgart, it might take a while but it is worth it especially considering the fact the the Shuggabush only takes up two beds. To breed a Ghazt you need to breed an Entbrat with a T-Rox (it takes several tries) most of the time it comes out T-Rox but eventually it will come out a Ghazt. To breed any single element ethereal monster all you need to do is breed a four element monster (Entbrat, Deedgee, Riff, Shellbeat, Quarrister) with a three element monster.