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I've actually done some Gameboy programming while taking Assembly classes. It should be known right now that the tool used to make sprites for Gameboy games is clunky to work with, especially if you're a traditional artist.
You have an extremely limited color pallet, and you have to make the sprite in two pieces. The top of dragonite would have to be drawn completely separate from his lower section. This is because Pokemon sprites are 16X16, and the tile designer has a max width of 8X8.
>pic related, the "modern" tile editor Ala 2003, this is actually an improvement over what GameFreak would have had