In the core series games
If held by a Sceptile, allows it to Mega Evolve into Mega Sceptile if its Trainer has a Key Stone. Each Trainer can only Mega Evolve one Pokémon per battle.
Unaffected by item negating effects (such as Embargo and Klutz). Item manipulating effects (such as Trick and Fling) cannot give Sceptile a Sceptilite or remove a Sceptilite from Sceptile.
Outside of battle
If held by a Sceptile, allows it to Mega Evolve into Mega Sceptile when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Sceptile will remain a Mega Sceptile until the Talent Round ends.
Pokémon holding Sceptilite in Pokémon Omega Ruby and Alpha Sapphire cannot be traded to Pokémon X and Y.
| One of a variety of mysterious Mega Stones. Have Sceptile hold it, and this stone will enable it to Mega Evolve during battle.
In the anime
In the manga
In other languages
|| 蜥蜴王進化石 Xīyìwáng Jìnhuà Shí
|| 蜥蜴王進化石 / 蜥蜴王进化石 Sīkyihkwòhng Jeunfa Sehk
|| 나무킹나이트 Namukingnite