You mean Cresselia.
It is after the elite four, when you go back to Canalave city (the one west of Professor Rown's lab) you talk the sailor on the southwest of town (house with sign on that side near the pier) he will say his child is suffering a nightmare. Talk to him outside, and he will take you to Cressellia's island. you go there, talk with cresselia, but...it will run away and roam Sinnoh. The item it leaves behind cures the child in Canalave city. hope this helped.
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The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.
You can find Aron only in Diamond.
No. A hippo isnt a pokemon.
well, dig isn't a HM in Pokemon diamond, but it is an TM. anyway, you can find it on route 214, inside a cave where you'll find the ruin maniac- the same place where you find hippopotas.
Right, You cannot get an pp max in Pokemon diamond or Pokemon pearl nor platinum!