To get a Monster on Wublin Island, you will first need to buy a Wublin statue from the Market using Coins. You will then need to wake up the Wublin by zapping the required Eggs to its Inventory. 

Once you zap the first Egg to a Wublin’s Inventory, the timer to wake it up will begin. If you do not fill its Inventory before the timer runs out, the Eggs will expire and you will need to try again, but you will be compensated for the Eggs lost.