To get to Viridian Forest, you need to go through Digglet's cave. That will bring you to an open area. Go North, the Forest should be there.
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Look in Viridian forest and headbutt trees.
Ilex Forest and Viridian Forest using the Hoenn Sound.
in Viridian Forest looks like a pokeball
You Can Catch Pikachu In Viridian Forest. Morning
viridian forest and the Yellow Forest route on the Pokewalker. They may have some rare moves if you catch them there.