Quickly, I want you to edit your post and specify ON TOP OF or TOUCHING the chargestones before wyverii refs and you can't change it-- this is vital to specify. also, the stomping with the sparks thing doesn't really make a lot of physical sense to me; you should Stomp to aggravate the spiders, sure, but I don't see how that's gonna damage Privatyke. You gotta play super defensive to take one of them down before they get you, man.. And don't forget that Charmander can't do the chargestone thing like Rhyhorn ccan, so we basically NEED to take down privatyke with rhyhorn here.
Honestly I think you pretty much NEED to counter all his waterfalls so he dies as quick or quicker then you... Don't let me down here, man! QUICKLY GOGOGO