they like the blue ones made with oran berries, and they are north of the entrance using the acro bike go to one of the poke block bait thing and run around a couple times.... works great caught mine in like 5-10min Good luck
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Blue ones
This depends on the pokemon's nature, not the species.
you go to slateport and get the pokeblock case first which is what i didnt know to do and then go in the pokemon competition thingy then there is a girl in the bottom left corner. Go to her and she says something like here have one ive got two and that is the pokeblock case. Then go to the safari park and then i dont actually know where to find heracross but i guess youd go somewhere in the grass at the start
Pokeblock's are not in diamond instead there called poffin's, just like ruby, sapphire and emerald in the Pokemon contests you can create your own poffin using berries.
The type of Pokeblock that a hardy nature Pokemon likes is one made with berries. These can be found throughout the game.