Because l like to use them. It makes posts look more... interesting.
(BTW--by the way), if you don't know, by 'moving' sprites, I mean this:
I got this off a website I saw, but it lags a lot. Because of all the moving sprites.
The Pokemon Database has much more to offer than this Q and A my friend, such as the [Sprite Gallery.] This includes the moving sprites from Generation V.
You may obtain moving sprites for all 649 Pokemon. Hope this helps