In a forest outside of New Bark Town, Ash solved a territory dispute between the local Heracross and Pinsir. Afterwards one of the Heracross who grew fond of Ash and his Bulbasaur decided to accompany him on his Johto journey.
Ash's Heracross is a strong, loyal and docile Pokémon whose feats of strength include lifting a big mechanical Pinsir and defeating Gary Oak's Magmar at the Silver Conference despite a type disadvantage. It loves to eat sap and nectar, which is often the main motivation for its actions: it may appear to be acting brave or heroic, only to later reveal that it was trying to get some food. Heracross often tries to suck the nectar out of Ash's Bulbasaur's bulb, much to Bulbasaur's annoyance.
Heracross was sent to Professor Oak in exchange for one of his Tauros, however, when Ash wanted to trade back Professor asked for more time to study Heracross to which Ash agreed. Heracross was eventually recalled and it competed with Ash as his trainer in the Silver Conference but remained at Oak's Laboratory when Ash departed for the Hoenn region.
Clash! Heracros VS Kailios!!
A Sappy Ending
The Valley of Donfan!
Roll On, Pokemon
Kireihana's Battle Dancing!
Itomaru! The Great Investigation!!
Bulu's Magnificent Life!?
The Ledyba Flute!
The Whistle Stop
A Bout With Sprout
Huge Pinch! The Madatsubomi Tower!
Kikyo Gym! Battle in the High Skies!!
Fighting Flyer with Fire!
Charizard's Burning Ambitions
The Lizardon Valley! Till the Day we Meet Again!
Chikorita's Big Upset
Chikorita is in a Bad Temper!?
Hanecco Jumped! The Fight in the Big Meadows!!
Foul Weather Friends
Wired For Battle
Let's Battle! Hassam VS Heracros!!
Hiwada Town! Yadon's Well!!
A Shadow of a Drought
Kunugidama and Bonguri Fruit! Fight on the Mountain in Back!!
Ubame Forest! Search for Kamonegi!!
A Farfetch'd Tale
Burn on, Zenigame Gang! Like a Flame!!
The Fire-ring Squad
Battle at the Radio Tower! Surpass Time and Space!!
Goodbye, Fushigidane! Adventure in Okido's Garden!!
The Ties That Bind
Decisive Tournament! Full Battle 6 VS 6!!
Can't Beat the Heat!
Rival Confrontation! Kamex VS Lizardon!!
Burshamo Once Again! The Fight against Hazuki!!
Playing with Fire!!
The Okido Laboratories! Everyone Gathers!!
The Right Place at the Right Mime
Fierce Fighting! Jungle Battle at the Battle Palace!!
Ka Boom With a View!
Usohachi King and Manene Queen!?
King and Queen for a Day!
An Old Family Blend!熱戦前夜！サトシのポケモン大集合！！The Night before the Fierce Fight! The Great Assembly of Satoshi's Pokémon!!
League Unleashed!開幕！ シンオウリーグ・スズラン大会!!Begin! The Sinnoh League Suzuran Tournament!!
The Semi-Final Frontier!シンオウリーグ準決勝！ダークライ登場！！Sinnoh League Semifinal! Darkrai Appears!!
Dream Continues!オレの夢、ポケモンマスター！！My Dream: Pokémon Master!!
Huge Battle at Okido's Residence!
Journey to the Starting Line!