Amada Printing Co. was one of the main sticker based collectibles manufacturer for Pokemon (and other franchises) from 1996 until 2004-2005. Ensky took over their work after that.
They manufactured some of the most famous stickers sets in the pokemon hobby, especially the first three sets which were mass-produced at the time. Below you will find a small timeline of the main amada sets. The promo sets should be added someday.