only vapreon
Yes, you can dig up a waterstone in Pokemon platinum underneath the resort area.
you can get many waterstones underground you just go there by the exporer kit
lombre and staryu.
1. Poliwhirl= Poliwrath 2. Eevee= Vaporeon 3. Staryu= Starmie 4. Lombre= Ludicolo 5. Shellder= Cloyster
all i kno r vaporeon and poliwrath
you use a water stone
Exchange Blue Shard with the Waterstone. You'll find waterstone in Abandoned Ship, too.
Poke'athalon
I know poliwhirl will evolve to poliwrath and that shelder will evole to cloyster with the waterstone
You can buy one with Athlete Points at the Pokeathlon Store on some days, or you can get a Waterstone from Bill's grandfather after you show him a certain Pokemon.
no.
Dig it out in the underground.