I have been trying to look for this poster-image of Lugia, which I saw some years back as a poster (never bought it though). The background features an environment not unlike polar regions in daytime, with a lot of random Pokémon on it (Pikachu is one of them), and in the middle of the picture, there is this large-sized Lugia flying and striking a pose. If there is such a picture in wallpaper size, it's better - basically, the larger and better quality, the better.