It reappeared inA Battle Hand-Off!, where Ash used it to perform 10,000,000 Volt Thunderbolt once again to defeatJessie's Mimikyu at theThrifty Megamart. Afterwards, it once again reverted back to an Electrium Z.
Ash's Electrium Z transformed into Pikashunium Z once more inFrom Z to Shining Z!, appearing in response toProfessor Kukui performingGuardian of Alola withTapu Koko. With their signature Z-Move, Ash and Pikachu were able to overpower Tapu Koko's Z-Move and defeat it. This time, however, the Pikashunium Z did not revert back into an Electrium Z afterwards.
The Pikashunium Z has been featured in thePokémon Z-Ring toy line byTakara Tomy; namely in the Pokémon Z-Power Ring special set.
Trivia
The name of the Pikashunium Z is a portmanteau of the wordsPikachu andAsh (orSatoshi for Japan), referring to the fact that it can only be used byPikachu in a cap, which is wearingAsh's hat.
The thunderbolt-like shape seen on the Pikashunium Z resembles a Pikachu's tail. Additionally, the left edge of the "thunderbolt" resembles aPikachu's fingers.