It's Umbreon. You can't catch it in the wild but you can get it by levelling up with happiness at night.
Trainers with an Umbreon are:
Collector Dean (also has an Espeon) found on Route 212 South
It is Umbereon and a trainer has it somewhere in Rt.212
There is no rental Pokemon in in Pokemon platinum
You cant get Pokemon from Pokemon ranger to platinum!
how to get a togepi in Pokemon platinum
There is no grunt that you can give a Pokemon to in Pokemon platinum.
buy the Pokemon platinum book
yes there is a new Pokemon in Pokemon platinum. its name is Arcues.
The 151st Pokemon is Mew and is unobtainable in Pokemon Platinum.
In the National Pokedex in Pokemon Platinum Mawile is Pokemon 303.
That pokemon is Azumarill in pokemon platinum in the national pokedex
Petalburg City is not in Pokemon Platinum.
There are a lot of events on Pokemon Platinum.