|English||Spanish for "Synchronized Zero"
Japanese for "United Hollow Flash"
|User||Pesche Guatiche & Dondochakka Birstanne|
Cero Sincrético (融合虚閃 (セロ・シンクレティコ), sero shinkuretiko; Spanish for "Synchronized Zero", Japanese for "United Hollow Flash";Viz "Fusion Cero") is a variation of the Cero technique used by Pesche Guatiche & Dondochakka Birstanne.
Pesche and Dondochakka charge their Cero simultaneously and combine them, forming a large, swirling sphere, before firing the combined Cero as a multicolored beam. Although it does not work on him, Szayelaporro Granz states it is a "marvelous technique" and admits he would have been defeated if Pesche and Dondochakka had used it before he had time to analyze their Reiatsu. Its use greatly drains Pesche and Dondochakka, leaving both of them panting and ready to collapse after performing it. However, there is a small fissure between the two Cero, as they are not perfectly fused; by applying pressure on this fissure, the combined Cero will split apart and harmlessly pass around the target.