i happen to think that Magikarp is the weakest fighting Pokemon. it is possible that it learns moves, but it only does 1 ir 2 damage.
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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
Here are the considerably weakest 6 pokemon in Gen 1:Caterpie, Weedle, Magikarp, Rattata, Pidgey, Paras.
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.
There are no Pokemon that are Ground AND fighting, yet.