HGSS FAQ said:Q: When my opponent has Uxie, Mesprit, and an Azelf (MT) with the “Downer Material” Poke-Body in play, what is the Energy cost for Ho-oh LEGEND’s “Bright Wing” attack?
A: It’s 4 units of Fire Energy. The Downer Material Poke-Body has an effect that works on the opponent’s Basic Pokemon. Ho-oh LEGEND has a special rule called the “Legendary Pokemon rule”. Since it’s treated as a Legendary Pokemon and not a Basic Pokemon, the effect of the Downer Material Poke-Body doesn’t hit it.