I think fire and flying are good against nature type pokemon!!
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its Arceus (he is the Pokemon GOD )
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?
Gary's Blastoise
Cynthia
The strongest Pokemon I met is a 100 lvl Magikarp in Resort Area(I call it King Magikarp :D )