Natural ticks are an important element in Pokémon Brilliant Diamond and Brilliant Pearl. They allow you to change the nature of a Pokémon, depending on the type of mint you use. A Pokémon's nature can affect its stats, and for true min / max parties, you'll want to have the correct nature for every Pokémon in your party. This could lead to a valuable improvement in their stats.
The bad news is that you won't be able to get them until you've completed the game and are in the post-match content portion. To get the Nature Ticks, players will need to reach the battle part after completing the main story. Here they can earn battle points.
Players can visit the Battle Park shop where they will be able to purchase Nature Mints for 50 Battle Points per mint. Once you have the mint, you can simply give it to the Pokémon you wish to change.
To check a Pokémon's nature, open the menu and select the Pokémon tab. Click the group member you want to review and select Check Summary. Tab on a page using the right directional key and the first line will tell you what kind of nature the Pokémon has.