Instructions
Create your garden on the map Dessert Desert. This is the only map where you can capture a Sweetle.
Place yams anywhere in your garden. Sweetles love yams, and they will be easily lured to any garden that has them.
Create at least one square pinometer of sand. A pinometer is a normal unit of measurement in "Viva Pinata: Pocket Paradise" and won't take up much space in your garden, largely because of the Sweetle's small size. Once the area has been created, the Sweetle will automatically go to the pen. Although, it will expect yams to be placed in the area if you want it to stay.