Treecko was caught in the episode Tree's A Crowd! after Ash helped him in trying to save his old tree home; this event was followed by a battle with Ash's Pikachu, and Ash caught him as a result of that battle. Treecko evolved into Grovyle in the episode Exploud and Clear while in the middle of a battle against Guy's Loudred. He evolved into Sceptile in Odd Pokémon Out in a fight against Team Rocket. Until Cutting The Ties That Bind, Sceptile lost his ability to use attacks due to a broken heart. He regained his attacks in the above-mentioned episode
Sceptile has since become one of Ash's most powerful Pokémon, even strong enough to hold its own in battle against certain legendary Pokémon. It is exceptionally fast and a good jumper. Unlike others of his species, Sceptile keeps a twig in his mouth much like a 番長 banchō, juvenile gang leader, a character type that was common in manga and anime in the sixties and early seventies. He is also a bit of a loner, and can often be seen sitting solitary on the branch of a tree, resting or looking at the sky. Both of these habits are carried over from when Sceptile was a Treecko. Despite this, Sceptile is a competitive battler, almost never turning down a fight. Sceptile was one of five Pokémon that Ash took with him on his journey to the Battle Frontier.
Sceptile is the third of Ash's Pokémon to show interest in a Pokémon of a different species (a Meganium) The first was Totodile who has shown interest in an Azumarill and a Quagsire, and the second was Corphish who has shown interest in a Mawile.
Ash's Charizard and Ash's Sceptile are the only starter Pokémon that Ash owns that have evolved to its final stage.
Sceptile is Ash's second Lizard based Pokémon after Charizard.
In the Latin-American dub, its Leaf Blade attack is incorrectly called Hojas Navaja, but just by Ash.
May's Venusaur can be seen as a parallel to Sceptile, as both are the final form Grass-type starter Pokémon from the region that co-starred in Generation III with their owner's home region.
Sceptile was the second of Ash's pokemon to learn Solar Beam, the first being Bulbasaur
