The complete Pokemon Diamond and Pearl pokedex, part 4

Pokémon Name: Gastrodon
Type: Water / Ground
Classification: Sea Slug
Pokédex Number: 061 Sinnoh / 423 National
Ability: Sticky Hold – Prevents any held items from being stolen or removed; Storm Drain – All Water-type attacks are drawn to this Pokémon
Dream World ability: Sand Force – Rock, Ground and Steel-type attacks get 30% power boost during sandstorms and gives user immunity to sandstorm damage
Useful Attacks: Muddy Water
Location Found:
Diamond/Pearl: Routes 218 and 221, Fuego Ironworks (West Sea type); Routes 213, 222, 224, and 230 (East Sea type)
Platinum: Routes 205 and 218, Fuego Ironworks, Valley Windworks, Canalave City (West Sea type); Routes 212, 213, 224, Pastoria City (East Sea type)
HG/SS: Evolve from Shellos
B/W: Poke Transfer, evolve Shellos from Dream World

Those wee slugs were downright cute when they were young, but once they’ve evolved...are a different story. These enormous slugs use their massive pseudopodia to get around, and prefer to play in mud. Once evolved, Gastrodon gains a Ground type, negating damage from Electric-type attacks but doubling the effectiveness of Grass-type attacks – if it weren’t so useful we’d be bored of it by now, after Wooper, Barboach and Marshtomp pulled the same trick. Gastrodon learns the new attack “Muddy Water,” a Water attack as powerful as Surf with the added bonus of lowering the enemy’s accuracy – are the days of Surf’s dominance finally numbered?