I would say a team of Lv.100 Pokemon would work,for example,Lv.100:Garchomp with
Dragon Rush,Dig,Ice Beam,Crunch.Mamoswine with Earthquake,AncientPower,Ice Shard,
Blizzard.Torterra with Giga Drain,Earthquake,Crunch,Razor Leaf.Aerodactyl with Ice Fang,
Crunch,Iron Head,AncientPower.Nidoking with Poison Fang,Dig/Earthquake,Focus Punch,
Ice Beam.Dragonite with Outrage,Aqua Tail,Ice Beam,Aerial Ace.Heracross with Close Combat,Megahorn,Aerial Ace,Feint.Magmortar with Confuse Ray,Fire Blast,ThunderPunch,
Faint Attack.Electivire with Thunder,Fire Punch,Focus Blast,(if it learns this,)Ice Punch.
Also,Rhyperior with Rock Wrecker,Horn Drill,Megahorn,Earthquake.
arceus is i said party not single pokemon.
I'd say mewtwo
Normally it would be Giratina, but with the special event its Arceus hands down
the strongest water Pokemon is Palkia
They are not found in the wild in Pokemon Platinum.
well the strongest Pokemon you can catch is raqazza a legendary dragon Pokemon
I think , all of the legendary pokemons.
PIKACHUUUUU
Rayquayza
shymin
There are many Water Type Pokemon in Pokemon Platinum, however, there is only one strongest one. That Pokemon is Palkia. Palkia is one of the Main Storyline Legendaries in Pokemon Pearl, it is a Water/Dragon Type. If you are looking for the strongest Non-Legendary, your best bet is Gyarados. Any exceptions?
Moltas: the fire legendary bird Pokemon the second strongest bird Pokemon