Go north from Viridian City or south from Pewter City.
you have to wait till the end of the viridion forest or watever it was called, then, when pikachu's health is low, drag the pokeball from the bottom to him
in the forest
There is no such thing as a Yellow Forest.
you find it at viridian forest
viridian forest.
There is it is in ilex forest
Budew can be found in Ilex Forest and Viridian Forest.
A man in Ilex Forest
in the forest there's a guy there.
Possibly in the forest
You can get one in Viridian Forest.
you can find a leaf stone in viridian forest in kanto in heartgold