Personally I think Pokémon are faking this whole weak against so-and-so act, but every time I try to question one about it all they say is their name.
What about Cthulhu? Isn't he a pokemon?
a water, psychic type pokemon!
Actually, though a lot of the weaknesses don't make technical sense they are all based on actual things. For instance Psychic types are weak against bug, dark, and ghost because they are mental fears.
The weakness of water to plant may be that plants suck up water, though so do animals in order to get a drink.
And Water is weak against grass, because plants absorb water.
One type advantage justification I rather like is why Fighting-types are strong against Dark-types: it’s like punching an emo kid in the face.
Knights are suposed to be passionate as flame, sturdy as a mountain, as unrelenting as a river, and move like the wind to adventure.
Yea Olde Dragons breathe fire, live in caves beneath the earth, have the scales of a fish, and have mighty wings strong enough to fly through even the most powerful storms.
Also, fire, grass, water, and electic attacks only do 1/2 damage to dragon types.
In 1st generation Dragon are not weak against any pokemon.