Roserade. But it takes patience to train it from a Budew at the beginning of a game
Fire types are good against Steel,Ice,Bug,and Grass Pokemon.
A good grass Pokemon in Diamond or Pearl would be Turtwig, his evolutions, Budew, Roselia, and Roserade. Those are the best I can think of. where to find some good grass Pokemon. I'm in the middle of training my Staraptor, and the best place to find some good grass type Pokemon, is the route before Sunyshore City, they are around level 38-43. Good place to train Staraptor, or any ice, fire or flying type Pokemon. x Hope I helped. x
In Pokemon Diamond i say Torrterra is the strongest grass and ground Pokemon because i have a level 100 one and it's great.
Look for them in the grass
Torterria
grass
It is found underground.
they're in the grass, water, and in rocks and caves
in the grass, caves, and water.
Fire: chimchar Water: piplup Grass: turtwig
probably turtwig. grass Pokemon are weak full stop.
the really long grass in resort area no pokeraider