The "Evolve" button shows a silhouette if you don't have the Pokemon you'd get from the evolution yet, but shows an image of the Pokemon if you already have it. The nearby raids feature also shows silhouettes; however, it shows silhouettes for Pokemon I already have. Does this feature always only show silhouettes? Will it show the Pokemon if I've completed a raid against that Pokemon before?
This is a screenshot of a Magmar raid; I have caught/hatched/evolved a few Magmars, but never raided one.