The milk can be found Just north of Solaceon town. the house is kind of like a bar, it was right in front of where those psyduck blocked the road.
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On Pokemon diamond you use moomoo milk for healing your Pokemon. Moomoo milk heals 100hp and costs P500 P.S. It is p700 cheaper than a Hyper Potion, but the down side is you can only buy them one at a time.
In Driftveil market place, you can buy up to a dozen of them.
go to driftveil market and talk to the women towards the top enterence.
i think you go to the psyduck next to the moomoo milk place then the Pokemon league champ will show up and give you it
the north route of solaceon town and you can see it by battling a milk maid in the house on the same route