There aren't many held items that can help grass-types in Sinnoh. Although there is one that players can find relatively easily, it is Rose Incense. This held item boosts Grass-type moves and can be of extreme importance when going up against the Pokémon champion.
Below, players can see exactly where to find Pink Incense in Pokémon Sparkling Diamond and Sparkling Pearl.
Finding Pink Incense in Pokémon Shining Diamond and Shining Pearl
The first thing players need to do to find Rose Incense is access the HM for surfing outside of combat. You can acquire Surf from Cynthia's grandmother in Celestic Town after helping defeat Team Galactic. However, you also need to access it to use it outside of combat, which only happens after defeating Hearthome City Gym Leader Fantina.
Once you've done that, stay in Hearthome City and head to the south exit door. This will take you to Route 212, where you should stay heading south. Keep running until you reach an area with green bushes and a small pond of water. Near this pond will be a flowery area and a Poké Ball surrounded by flowers.
You can just press "A" on the water to ride over it and drop down to the small area with the Poké Ball. The ball contains the Incense Rose, which you can feed to any Pokemon with a Grass-type move to buff it even further. You will now deal more damage with any Grass-type move on the Pokemon holding it.
Read more: Walk with Pokémon in Sparkling Diamond and Sparkling Pearl, how
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Image courtesy of Nintendo/The Pokémon Company.