From Bulbapedia, the community-driven Pokémon encyclopedia.
Promotional Tretta are special Tretta that can not be obtained by playing the game. There are two main types of promotional Tretta, which can identified by their color. Rookie Tretta (ルーキートレッタ) are orange and are usually included in retail items such as boxed sets or targeted publications. Trophy Tretta (トロフィートレッタ) are purple and are usually awarded as participation prizes in Pokémon Tretta tournaments or events.