it has to be summer
yes
gi in the grass
grass
You have to see grass and then go in the grass and battle. It is usually Elekid for me but try to get a Pokemon in White Forest. If there is no grass then you can't catch Elekid and other Pokemon so just try to get grass. :)
when you connect to other people's games through the highlink (entralink) you will unlock grass in white forest. The grass will hold Pokemon that are otherwise uncatchable in Unova.
grass, trees, moss, and ants
to get people, trees and grass in your forest, you need to connect with other people and go to entralink in the c-gear.Then choose a mission at the tree of the other person and go to his or her black city/white forest and talk to people there and some want to go to white forest and answer "yes"and go back to your own white forest and youll see that there are more people than before, same as more grass and greater trees
Find someone who owns Pokemon Black and use the Entralink to enter their Black City. Talk to people in there as they may want to move to your forest (which in turn makes grass and trees appear in the forest)
It means that everybody has left White Forest. You just need to go back to Black City and get people into White Forest again. Hope that helps.
Moss, Saplings, small amounts of grass or weeds, ect.
you dont need points the grass will be there from the start unless you hacked
you can find it in the pinwheel forest rustling grass