In the Hoenn Region, treecko evolves when he fought loudred who also evolved at the same time.
Treecko evolves into Grovyle and then Sceptile.
Whismur evolves into Loudred and then Exploud.
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Ash's Treecko evolves during Pokémon Advanced Challenge in the episode that is titled "Exploud and Clear."
treecko evolve l16 to grovyle then to l36 to sceptile
In the episode Trees a Crowd.
level 16