Bakugan Championship (BC)
From The Bakugan Wiki
Bakugan Championship (or BC-00#) are series of "Clear Type" [クリアタイプ] Bakugan given to winners in Bakugan Championship Tournaments or Mall Tours in Japan. Each Bakugan is boxed in a monochrome packaging and comes with the Bakugan itself on Clear color (but with Attribute and not entirely like the BakuCrystal Special Treatment in US/Canada) plus Attribute and G-Power stickers.
Two Bakugan were released under the BC series: Helios MK2 and Gigan Taures ver. 9.25.