The next Pokémon Scarlet and Violet Unrivaled Tera Raid event will feature Sceptile, and it has a hefty dose of Mega Evolution.
How to Activate 7 STAR Event Tera Raid Battles ► Pokemon Scarlet & Violet
Seven-star Sceptile Tera Raids are coming to Pokémon Scarlet and Violet from June 27 to 30, and again starting on July 4. The Gen III Grass Starter will have the Dragon Tera Type, which sounds like a no-brainer. While Sceptile is naturally pure Grass, its Mega Evolution also gives it the Dragon type. Mega Evolution was introduced as the special battle mechanic in Gen VI, but it won't appear in Gen IX until Legends: ZA launches next year.
Therefore, giving Sceptile the Dragon Tera Type for this raid event is the best alternative to tide us over until Mega Evolution officially returns. After all, it has plenty of Dragon-type moves to take advantage of, including Dragon Pulse, Dragon Dance, and Outrage.
And thankfully, the combination of Sceptile's natural Grass-type and its Dragon Tera-type shouldn't be too difficult to deal with. Fairy-type Pokémon seem like perfect counters right away, since Sceptile can't learn Poison- or Steel-type moves to deal super-effective damage. Fairy-type Pokémon are also immune to Dragon-type moves, so that's a great place to start when determining a counter.