It depends on how you look at the Pokemon stats. Plus, if you think your favorite water Pokemon is the strongest, then so be it.
Everyone has their own opinions.
By total base stats its a tie between Gyrados, kingdra, and milotic, they all have a total base stat of 540. But their individual stats arent exactly the same just overall its the same. Gyrados has the best attack among the three, and ties with milotic for the best HP. Just look up list of Pokemon by stats, and go to serebii.net and it shows all Pokemon just look for the types on the list
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Reshiram. But if you make any other Pokemon stronger than it by level, yes, then it will be that Pokemon. But if you look to it by the side of legends and legendary power, it is Reshiram.
Best non-legendary water pokemon would be Gyarados. Best legendary water pokemon is Kyogre.
The strongest dragon type in pokemon Emerald, Sapphire and Ruby, is the legendary pokemon Rayquaza. In terms of non-legendary pokemon, both salamance and flygon are strong dragon types.
Metagross with all-physical moves + agilityAnswerI think its Salamance,Milotic and maybe Metagross
I have a stoutland and its my favorite non legendary Pokemon but Reshiram and Zekrom both are the strongest Pokemon on black and white. This is the link to see the srongest and fastest ETC.