Most simple trick for this is you can visit your neighbors farm and harvest there hen house to get exotic super rare eggs. but it is very long procedure to visit all neighbors for rare eggs. so there is one more trick which is very helpful in this task.
for this trick you need cheat engine.
- Open farmville in your web browser.
- Open cheat engine
- Select farmville process.
- Now change value type to Double
- Scan: 86400
- Change To: 1
you can harvest your hen house as many time as you want.