What is the easiest way to get a rose and a lucky collar in nintendogs?

In Nintendogs, the easiest way to obtain a rose is by visiting the "item shop" where you can purchase it directly. For the lucky collar, you can get it by winning competitions or by finding it in the game’s various areas. Additionally, sometimes items can be received as gifts from your friends' dogs if you connect via DS wireless. Regularly playing and exploring will increase your chances of finding these items.