Bianca's Escavailer is a Pokemon that used to belong to Professor Juniper when it was a Karrablast. It was traded for Bianca's Shelmet in BW065.
Escavalier appeared as a Karrablast in BW065 where it was owned by Professor Juniper. Since Bianca wanted to trade her Shelmet for Karrablast, they managed to trade. Karrablast and Shelmet both evolved into Escavalier and Accelgor respectively.
Later, Escavalier started to disobey Bianca and chase her around until prof. Juniper suggested with her Accelgor to have a double battle agaisnt Ash's Boldore and Cilan's newly evolved Crustle. During the battle Escavalier started to go on it's own ignoring orders from Bianca and ramdomly using attacks that were causing it and Accelgor to lose the match, later Escavalier was about to get hit by Boldore's Flash Cannon but was protected by Accelgors Substitute causing alot a damage to Accelgor but thanks to this it learned to listen to Bianca. Escavalier and Accelgor battled hard and defeated Ash's Boldore, despite that they were finnaly defeated by Crustle's Rock Wrecker.
It reappeared in BW106 where it was the first pokemon used by Bianca in the 2nd round of Unova league against kotetsu's samurott, it used Iron Defense to stand up agaisnt samurott's powerful razor shells, but at last it's endurance ran out after taking too much of samurott's powerful Razor shell rusulting in it's defeat.