As long as Flygon has any Energy attached to it, the Retreat Cost for Flygon is 0.
Sand Pit すなじごく
The Defending Pokémon can't retreat during your opponent's next turn.
This card was released in POP Series 4, originating as one of the Japanese PCG-P Promotional cards. In Japan, it was released as part of a McDonald's campaign in February 2006. A Cosmos Holofoil version of the English print was one of two cards available in the Epic Collection Value Boxes, released on May 9, 2007.