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Pyroar @ Life Orb Ability: Unnerve EVs: 4 HP / 252 SpA / 252 Spe Timid Nature IVs: 0 Atk / 30 SpA - Taunt - Hidden Power [Grass] - Flamethrower - Hyper Voice
It's supposed to replace Magmortar, as it's naturally much faster, has an alternative STAB, and is a pretty good wallbreaker with Taunt to shut down stalls. Magmo on this team hits hard af but it's not very fast, is a glass cannon and it's not too hard to switch something on it that can take advantage of it being locked into something and have at least one free turn.
Klinklang @ Lum Berry Ability: Clear Body EVs: 156 Atk / 100 SpD / 252 Spe Adamant Nature - Shift Gear - Gear Grind - Wild Charge - Return
Doesn't need too many EVs on Attack thanks to its nature and Shift Gear, therefore it has some investment in the SpDef to survive more hits.
Lilligant (F) @ Leftovers Ability: Own Tempo EVs: 4 HP / 252 SpA / 252 Spe Timid Nature IVs: 0 Atk - Aromatherapy - Quiver Dance - Sleep Powder - Petal Dance
Sleep Powder, QD and kill. The EVs are self-explanatory.
Barbaracle @ White Herb Ability: Tough Claws EVs: 4 Def / 252 SpD / 252 Spe Adamant Nature - Shell Smash - Poison Jab - Stone Edge - Razor Shell
Due to SS, Tough Claws and Adamant, it doesn't really need EVs on the Attack. With this it has balanced defenses and can sweep well.
Each of these setup sweepers have their own strengths and weaknesses. About replacing, any of them for any of the Specs pokemon (who are rather frail and slow) on your team is a welcome change.
Rotom-Fan @ Leftovers Ability: Levitate EVs: 112 Def / 32 SpA / 112 SpD / 252 Spe Modest Nature IVs: 0 Atk - Pain Split - Will-O-Wisp - Air Slash - Volt Switch
An alternative build to Rotom-F, a more self-sustainable and crippling one in fact. Its speed, SpAtk and defences are balanced and it'll probably survive through most of the match.
Ditto @ Sitrus Berry Ability: Imposter EVs: 252 HP / 252 Spe IVs: 0 Atk - Transform
lel. This one is to get ahead of the opponent in dire times. Replaceable with any of the Specs mons.