Personally, whilst I think dedicated leads like smeargle ended with defog changes and other meta shifts, there are some pokemon that a good leads, not necessarily for setting up SR/Spikes/Dual screens.
Firstly, I'm going with Mamoswine with SR, EQ, Ice shard and Icicle crash, holding a focus sash. Its safe to say that Mamoswine 130Atk means it can deal good damage, and remove other leads like Klefki quite easily with STAB Earthquake. Similarly, if they have a counter to the swine as lead, it can take the hit, set up rocks and switch out as a pivot for later. Ice shard priority can be very useful and he can also be used as an effective Dragon check.
The lead I'm currently running however is M-Banette, with frisk allowing to scout the opponents threat, protect to allow it to prankster next, able to stop physical attackers with Will o wisp or stop a set up sweeper with destiny bond. It's base 165 atk can allow it to dent several threats with STAB shadow claw.
Finally, the aforementioned Noivern is a good lead, with U-turn, frisk, and the ability to trick away choice items at speed.