Don't use this:
Why it's bad:
I admittedly don't see this an awful lot on the ladder but I can see why people would be drawn to it and why it might rise in usage. With no way to boost it's excellent Special Attack outside of the unreliable lightningrod, many would naturally be drawn to the fact Sceptile has a great physical movepool that includes dual STAB and has an amazing way to boost this with Swords Dance. Couple this with a speed tier only outpaced naturally by Mega Aero and Mega Zam and Sceptile may seem the ideal sweeper. This unfortunately is not true. 105 base attack is downright terrible without a boosting item or ability and your primary STAB of Grass isn't getting you very far either. While this can actually work as a possible lure or surprise factor, you really have to know what you're doing in part due to it's great frailty and it should never be your primary choice for Mega Sceptile or a physically-inclined mega dragon sweeper.
Use this instead:
Why it's better:
All-out attacking with Leaf Storm or hiding behind a Substitute to fire off strong special attacks is where Sceptile's true strengths really lie. Sceptile handles offensive teams in this fashion extremely well by revenge killing slower dragons and other frailer fast attackers such as Mega Lopunny with a strong STAB leaf storm. A Substitute set also works out really well because Sceptile can force a lot of switches and stay safe behind a sub, proceeding to recover health for more substitutes through Giga Drain and nabbing a lot of 2HKOs it wouldn't usually.
Or...
Use these instead:
Why they're better:
If you want a physical dragon mega sweeper, these should be your first considerations. Mega Charizard X is still as good as it was in XY; Dragon Dancing once already makes it better than a +2 Mega Sceptile due to the higher speed at +1, the higher base attack, tough claws and adamant making it more powerful at +1 than +2 Sceptile, having a better secondary STAB and better bulk. In addition it gets longevity in Roost and cannot be burned, sealing the deal on why Swords Dance Sceptile has nothing over it but a T-wave immunity -- which is admittedly useful but it's a very small niche and again, you really have to know what you're doing and I wouldn't recommend this to someone unless they're experienced. Altaria is a viable choice as a D-Dancer over Charizard with Fairy STAB, a better defensive typing and general bulk.
Sceptile@Sceptilinite
Jolly
252 atk/4 dfc/252 spd
-Swords Dance
-Leaf Blade
-Dragon Claw/Outrage
-Earthquake
Jolly
252 atk/4 dfc/252 spd
-Swords Dance
-Leaf Blade
-Dragon Claw/Outrage
-Earthquake
Why it's bad:
I admittedly don't see this an awful lot on the ladder but I can see why people would be drawn to it and why it might rise in usage. With no way to boost it's excellent Special Attack outside of the unreliable lightningrod, many would naturally be drawn to the fact Sceptile has a great physical movepool that includes dual STAB and has an amazing way to boost this with Swords Dance. Couple this with a speed tier only outpaced naturally by Mega Aero and Mega Zam and Sceptile may seem the ideal sweeper. This unfortunately is not true. 105 base attack is downright terrible without a boosting item or ability and your primary STAB of Grass isn't getting you very far either. While this can actually work as a possible lure or surprise factor, you really have to know what you're doing in part due to it's great frailty and it should never be your primary choice for Mega Sceptile or a physically-inclined mega dragon sweeper.
Use this instead:
Sceptile @ Sceptilite
Ability: Overgrow
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Substitute
- Giga Drain
- Dragon Pulse
- Focus Blast
Or
Sceptile @ Sceptilite
Ability: Overgrow
EVs: 4 Def / 252 SpA / 252 Spe
Naive/Timid Nature
- Leaf Storm
- Earthquake/Protect
- Dragon Pulse
- Focus Blast/HP Fire
Ability: Overgrow
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Substitute
- Giga Drain
- Dragon Pulse
- Focus Blast
Or
Sceptile @ Sceptilite
Ability: Overgrow
EVs: 4 Def / 252 SpA / 252 Spe
Naive/Timid Nature
- Leaf Storm
- Earthquake/Protect
- Dragon Pulse
- Focus Blast/HP Fire
Why it's better:
All-out attacking with Leaf Storm or hiding behind a Substitute to fire off strong special attacks is where Sceptile's true strengths really lie. Sceptile handles offensive teams in this fashion extremely well by revenge killing slower dragons and other frailer fast attackers such as Mega Lopunny with a strong STAB leaf storm. A Substitute set also works out really well because Sceptile can force a lot of switches and stay safe behind a sub, proceeding to recover health for more substitutes through Giga Drain and nabbing a lot of 2HKOs it wouldn't usually.
Or...
Use these instead:
Altaria @ Altariaite
Ability: Natural Cure
EVs: 64 HP / 192 Atk / 252 Spe
Adamant Nature
- Dragon Dance
- Return
- Earthquake
- Roost
Charizard @ Charizardite X
Ability: Blaze
EVs: 144 HP / 252 Atk / 112 Spe
Adamant Nature
- Dragon Dance
- Dragon Claw
- Flare Blitz
- Roost
Ability: Natural Cure
EVs: 64 HP / 192 Atk / 252 Spe
Adamant Nature
- Dragon Dance
- Return
- Earthquake
- Roost
Charizard @ Charizardite X
Ability: Blaze
EVs: 144 HP / 252 Atk / 112 Spe
Adamant Nature
- Dragon Dance
- Dragon Claw
- Flare Blitz
- Roost
Why they're better:
If you want a physical dragon mega sweeper, these should be your first considerations. Mega Charizard X is still as good as it was in XY; Dragon Dancing once already makes it better than a +2 Mega Sceptile due to the higher speed at +1, the higher base attack, tough claws and adamant making it more powerful at +1 than +2 Sceptile, having a better secondary STAB and better bulk. In addition it gets longevity in Roost and cannot be burned, sealing the deal on why Swords Dance Sceptile has nothing over it but a T-wave immunity -- which is admittedly useful but it's a very small niche and again, you really have to know what you're doing and I wouldn't recommend this to someone unless they're experienced. Altaria is a viable choice as a D-Dancer over Charizard with Fairy STAB, a better defensive typing and general bulk.