A new news article has been posted!

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The 15th Pokémon Tretta set has been announced and it is also the 4th renaming updating for the game. The Pokémon Tretta Ultimate Set 1: Dragon Ascent! Black Mega Rayquaza Soars Through (ポケモントレッタ アルティメット1弾 ガリョウテンセイ！ 黒いメガレックウザ飛翔) features a new class of Tretta: ULTIMATE.

Rayquaza, the first ever Ultimate Class Tretta will also be introduced in this set as will Serena's Panchan come readily available as a Master Tretta.

Source: http://pokemontretta.com/tretta/t15/index.html