Ishizumai was first seen when Ash and company were on their journey towards Nacrene City in BW011. Ishizumai was busy making its house out of a rock, but three more Ishizumai appeared, attacked it and stole its rock, before escaping. Ishizumai tries to chase after them but fails. Ash and the others witness this, they try and help Ishizumai, but it is scared of the trio and attempts to run off. Pikachu tries to assure it, but the Stone Hermit Pokémon attacks Pikachu with Slash. Pikachu dodges its attack and Ishizumai strikes a rock instead. A piece of the rock flies off and hits Pansage on the head. Ishizumai feels bad and apologizes to it. The gang tries to help it but Ishizumai does not want any help and runs off.
It later returns to the group and Cilan invites it to have dinner with them. During dinner, Pansage collapses from a fever to which Ash suspects was caused by the rock that hit it earlier. Ishizumai becomes overwhelmed with guilt. It later watches over Pansage as it sleeps and soon falls asleep right beside it. The next day, after Pansage recovers, Ishizumai decides to search for its rock. With the help of the gang, it defeats the other three Ishizumai and gets its rock back. Later, after the group says their goodbyes and start to walk away, Ishizumai starts to follow them wanting to be a part of Cilan's team. Cilan agrees and captures it.
Ishizumai battled against Cabernet, another Pokémon Sommelier and rival of Cilan's in BW019. Ishizumai managed to bide its time agaist her Futachimaru with Protect and later defeat it with a combination of Shell Smash and X-Scissor.
