ANYWHERE
You an train Pokemon in the grass
Nowhere.
rt.224
There are various good places to train flying types in Pokemon Platinum. A good thing to do would be to use the vs seeker.
Yes, someone can help get a sixth Pokemon in Pokemon emerald. Swellow is a good Pokemon for flying types. Even though they are hard to train, dragon Pokemon make an excellent sixth Pokemon as they are "extra" but very powerful.
Other than secret bases the best spot is the Pokemon league.
I would like to know...
Try the grass in Lilycove City, or go train in Victory Road.
you train them
train your pokemon
Yes, you can
Well a good place to train would be Route 120, 121, or 122. Or routes 126, 127, or 128. Or just the wild pokemon of victory road.