That depends whether you consider Rotom a legendary. If you do then Rotom is the weakest, if not then it's Phione.
This is judged on total base stats.
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rotom is not legendary so dialga or palkia are 47
The weakest Pokemon in diamond is a magikarp. It is also the weakest of all the Pokemon existed. Magikarp is weak but it will evolve to a mighty gyarados.
The weakest in the whole entire game is magikarp
It is a rare pokemon, but it is not a legendary pokemon
Unknown is not a legendary Pokemon but it is considered rare. Legendary Pokemon are one of a kinds.