The West Sea variety of Gastrodon is available at Routes 228, 221 and Fuego Ironworks.
The East Sea variety is available at Routes 213, 222, 224 and 230.
Or, alternatively, you can evolve a Shellos.
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You can use Pokemon like: Buizel, floatzel, gastrodon, and possibly finneon and lumineon
You can either catch a Shellos or you can find a Gastrodon in water areas I think.
Please feel free to add what you think is the strangest Pokemon in Diamond and Pearl.1. Ugly wise its Purrugly.2. Form wise Gastrodon and Shellos.
Shellos evolves at level 30 into Gastrodon. It is the same on Diamond, Pearl and Platinum.
you do not find dialga in Pokemon pearl