you first go back from heathrome city and where you get the odd keystone go up and go into the house and talk to the girl then the man for berrys and fertilizer.
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Talk to the little girl in the berry master's house by Hearthome city
You can't get the Miracle Berry without the Shamin event.
there isn't a berry blender in Pokemon platinum sadly. but instead of making pokeblocks you make poffins in hearthome city just look for a house near the Pokemon fanclub that says some thing like poffin maker place.
The Berry Master is in a house on Route 208 in Pokémon Platinum.
there is no code but if you want a good poffin use an oran berry or a magov berry and stirr the WRONG WAY it is pointing to....... hope that helps