Pesquisa

is an advanced Arrancar perception technique.

Description
The practitioner sends out a radiating pulse which reacts to sources of Reiatsu within a certain proximity, allowing the practitioner to determine the location of any sensed individuals and gauge how powerful they actually are. When the ability was performed by Grimmjow Jaegerjaquez and his Fracción, each closed their eyes and entered into a meditative state of mind in order to attain the necessary heightened sense of awareness.

Out of all those who have used this technique, including two other members of the Espada, Ulquiorra Cifer has proven to be the most adept with it, precisely determining the level of an opponent's Reiatsu with a mere glance and being able to use it to monitor his enemies' location in the event he can't see them. Despite this, the Sonído of Zangetsu was quick enough to allow him to pass through Ulquiorra's Pesquisa and was able to move behind him without him realizing it until the Sonido was over.