is there an Elysian Whip at any point in Fire Emblem: Shadow Dragon?
The Elysian Whip is available in Fire Emblem: Shadow Dragon, as well as several other games from the Fire Emblem franchise. It first appears in Fire Emblem: Shadow Dragon and the Blade of Light (1990).
In Fire Emblem: Shadow Dragon (2008) can be purchased from the online shop.
You can read more about the Elysian Whip by viewing its Wikia Page