You give it to Arceus to change its stats and type.
go underground at route 220 and dig it out
It is actually called splash plate......u can find it at route 220 or underground
It is located in Route 220, on a small island, and there is not much more I know about it.
the splash plate is in pastaria city. use surf at the side of pastaria and go up it should be there. if not go undergroud and find it.
there isn't a aqua plate it is a splash plate, you find it underground
head past the two girl swimmers on route 220, and you will see a poke ball. it's the splash plate
the game of platinum
In the Underground
i have heard that splash only works if you are holding a water plate
there is no such thing as a "Curse Plate."
You can search on youtube. that's where i found mine.search Pokemon PLatinum plate locations.