Well I'm so glad I had to prompt you to actually do a decent post summarising your feelings, rather than that glib pointless thing you initially posted which lacked any kind of rational opinion. I really don't get why you and a lot of people on here don't just post what you think initially rather than just saying, "This is crap," and then waiting for the other person to ask them for more detail. It's wastes everyone's damn time as it doesn't add anything to the conversation, and beyond that I think it's highly rude and annoying.
You may survive a turn or two, but any opponent with a brain will realise that you're going to Z-Parting Shot into something after the first Confide/Charm, predict your switch in and switch into something that can beat it and won't care too much about taking a parting shot.
Okay, so this is impossible. Their switch happens before your Parting Shot or Z-Parting Shot, giving you the switch advantage and the momentum. So debuff move, they switch and you Parting Shot, you should have some setup sweepers that can't take advantage of what has just happened and anti-stallmons too to face the mons that don't care about the a -1/-1 debuff. Either way, you gained the momentum.
I never suggested Charm or Confide and manual switch, as you seem to be saying as that's the only way you lose momentum, as that's brain dead stupid when you have a fast Parting Shot. Either you fundamentally don't understand switching mechanics (you're saying you can just switch in
after Parting Shot in the same turn) or you didn't grasp what I was suggesting with the set. Sure some things don't care for a -1/-1, but that is why you pack some stallbreakers: SubCoil Zygarde, Stallbreaker Heatran, Taunt Mega-Gyarados, etc. Later in the match, Z-Parting Shot can full heal these once more, and give stall a fresh headache.
Or, if you're facing off against balance/BO/HO, somethings there will care about a -1/-1, and then you can you can bring in a potent sweeper: an SD Kartana against a physical mon without coverage, Zard-X, etc. You get a free boost as they switch out.
Both of these scenarios give you momentum that the opponent can't do anything about, and with Charm at the very least you're going to be forcing more switches than the regular set Persian set.
I see literally zero purpose of sending in a Persian to spam Confide with no way of dealing damage or recovering its lost health. You may survive a turn or two, but any opponent with a brain will realise that you're going to Z-Parting Shot into something after the first Confide/Charm, predict your switch in and switch into something that can beat it and won't care too much about taking a parting shot. I'd rather just Toxic something and then use the Parting Shot because at least you've accomplished something in the long run. Yes Charm is a good move because it will force a switch and then you can Parting Shot what they switch in. But that's just Charm. If your moveset comprises entirely of Confide, Charm, Taunt and Parting Shot you are REALLY limiting your options and you won't have a way of dealing damage when you need to. Pick either Charm or Snarl, invest EV's accordingly and stick with it, and don't try and run both. Persian can't do everything. You will find yourself having to deal with switch ins that don't care about you lowering their stats/can't have their stats lowered and it's nice to be able to have another option like Foul Play or Toxic at your disposal.
I always think the assumption that people make that a set suggested is acting in a perfect bubble is weird, there's a whole other team of support that you can switch in to deal with a mon that doesn't "care about you lowering their stats". You keep saying that Taunt and Toxic are so helpful against stall, but really Persian is never going to be handling stall by itself (you don't have any recovery with Darkinium-Z and can't do much of anything against Natural Cure Seismic Toss Chansey, Skarmory, Toxapex or Mega Sableye) so you're always going to be relying on other team mates to do that for you...
just like my set would be.
For the record, I also never said I'll definitely run both Confide and Charm, it was a suggestion. I'll certainly try both, but quite possibly Snarl works better over Confide, or Foul Play is better than Confide - I think it really depends on what exactly you want the set to be doing. I'll test it after Christmas when I have the time - on a team with both stall-breakers and regular strong setup mons who can take advantage of momentum either way. Who knew that you can actually have a whole extra team of pokemon to make up for the deficiencies that one pokemon has in it's role and typing?