the guy that's in the resort area is talking about the level 100 magickarp
Caterpie
KYOGRE and PALKIA.
underground
On water.
there is none
The water Pokemon gym leader is in Pastoria City.
the three starter Pokemon are the same in platinum as diamond and pearl. They are chimchar-fire, piplup-water, and turtwig-grass.
in the water by were you can find shaymin
it doesnt exist in Pokemon
pastoria city
in Pokemon platinum if you have a water type Pokemon go to the tutor men in pastoria city
The Underground