I believe you can get revelations physically with the limited edition which includes all three versions on the cart, but it's most likely very expensive and rare now. I got it for that reason alone years ago because I got a really good deal on it. All the modern Fire Emblems have had DLC, even that Echoes remake they did if I'm not mistaken. I don't know, I don't even like modern Fire Emblem.
Mario Golf had worthwile DLC I recall.