The strongest type of extreme weather in terms of overall energy output would probably be a tropical cyclone (hurricane, typhoon, etc.).
In terms of the violence of the event a tornado is the strongest.
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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?
grizzly wintergreen
If you include hms, and mean all around strongest, use surf.
I'm not that sure but a friend told me it was storm.
the strongest electric type move is volt tackle