Your search for "Flash Knight DUEA-EN001" revealed the following:
Flash Knight - DUEA-EN001 - Rare - 1st Edition from Duelist Alliance 1st Edition, available at 401 Games Canada. Rarity: Rare Card Text:The power of the pendulum flashes forth from this shining knight.
Doomcaliber Knight - TU01-EN001 - Ultra Rare - Unlimited from Turbo Pack: Booster 1, available at 401 Games Canada. Rarity: Ultra Rare Card Text:This card cannot be Special Summoned. When an Effect Monster's effect is activated, you must Tribute this...
Flash Knight - DUEA-EN001 - Rare - Unlimited from Duelist Alliance Unlimited, available at 401 Games Canada. Rarity: Rare Card Text:The power of the pendulum flashes forth from this shining knight.