head past the two girl swimmers on route 220, and you will see a poke ball. it's the splash plate
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Splash does nothing.
it's ZAP PLATE and you find it underground
go to the bottom of the waterfall at the Pokemon league.
Plates in Diamond and pearl are used to give to Arceus after you caught it. For example, if you give Arceus a splash plate, it will be a water type. If you give it a spooky plate, it will be a ghost type. Also, if you have a plate that is the same type as a Pokemon, it will boost its attacks. For example, if you have a Fist plate and a Pokemon that knows some fighting type moves, if you give the fist plate to the Pokemon that knows some fighting type moves, it wil boost its fighting type moves. -Written by Spencer Camacho
Finding the Insect Plate in Pokemon Diamond requires the use of the HM Cut. It is in Eterna Forest hidden in the wall to the right of the Old Chateau.