In the main series
Major appearances
Herdier debuted in Rematch at the Nacrene Gym!, under the ownership of Lenora. It battled against Ash and his Tepig during a Gym battle, but it was eventually defeated by Tepig's Flame Charge.It reappeared in a flashback in Certain Up, Unova League!.
Two Herdier appeared in A Venipede Stampede!, under the ownership of the Officer Jenny in Castelia City. They were used during an effort to curb the tide of invading Venipede.
A Herdier appeared in There's a New Gym Leader in Town!, under the ownership of Cheren. It defeated Ash's Oshawott with Thunder Fang during an unofficial battle.
A Herdier appeared in Deceiving Appearances!, under the ownership of Lusamine. She keeps it as company in her office at the Aether Paradise mansion. Herdier reappeared in a flashback in Mission: Total Recall!.
Minor appearances
A Herdier appeared in Trip's flashback in Ash and Trip's Third Battle!, where he remembered it being defeated by Alder's Bouffalant.
A Herdier appeared in a flashback in White—Victini and Zekrom and Black—Victini and Reshiram.
A Herdier appeared in Ash Versus the Champion!, under the ownership of another Officer Jenny.
A Trainer's Herdier made a cameo appearance in Cilan Takes Flight.
A Trainer's Herdier made a cameo appearance in Climbing the Tower of Success!.
A Herdier appeared in Kyurem VS. The Sword of Justice, under the ownership of Kanata. It was seen battling and losing against Misaki's Liepard in the Roshan City Pokémon Center. Another Herdier appeared during the Swords of Justice legend.
A Trainer's Herdier appeared in Curtain Up, Unova League!.
A Trainer's Herdier appeared in Team Plasma's Pokémon Power Plot!. Another Herdier appeared in a flashback in the same episode.
A Herdier appeared in Genesect and the Legend Awakened as a resident of Pokémon Hills.
A Trainer's Herdier appeared in Thawing an Icy Panic!.
Two Trainers' Herdier appeared in Alola to New Adventure!.
A Trainer's Herdier appeared in A Shocking Grocery Run!.
A Herdier appeared in Young Kiawe Had a Farm! at Paniola Ranch, which is owned by Kiawe's family. It was used by the family to herd all of the ranch's Pokémon. It appeared again in The Young Flame Strikes Back!, where it barked at Viren and his Electivire as they arrived at Paniola Ranch.
A Trainer's Herdier appeared in Racing to a Big Event!, where it participated in the Pokémon Pancake Race.
Two Trainers' Herdier appeared in Crystal-Clear Sleuthing!.
Two Trainers' Herdier appeared in One Journey Ends, Another Begins...
A Trainer's Herdier appeared in Getting the Band Back Together!.
A Trainer's Herdier appeared in A Glaring Rivalry!.
A Herdier appeared in Treasure Hunt, Akala Style!.
A Trainer's Herdier appeared in Faba's Revenge!.
A Trainer's Herdier appeared in Real Life...Inquire Within!.
A Trainer's Herdier appeared in Sours for the Sweet!.
A Herdier appeared in Don't Ignore the Small Stufful! as one of the Pokémon staying at Aether Paradise.
A Trainer's Herdier appeared in We Know Where You're Going, Eevee!.
A Trainer's Herdier appeared in SM129, where it competed in the Battle Royal round of the Manalo Conference but was defeated by Sandy and Shaymin.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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BW016
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Herdier
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Ash's Pokédex
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Herdier, the Loyal Dog Pokémon, and the evolved form of Lillipup. Herdier's hard black fur softens its opponent's attacks like armor.
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BW111
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Herdier
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Ash's Pokédex
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Herdier, the Loyal Dog Pokémon and the evolved form of Lillipup. Always obedient and faithful to their Trainers, Herdier have helped them raise other Pokémon since long ago.
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In Pokémon Generations
Lenora's Herdier appeared in The Uprising.