I don't think PZ is the level of Volcarona, but Volcarona is A+. I think Volcarona and Magearna are the only things that compare to Porygon-z in terms of special sweepers and they are A+ and S respectively. And I don't think PZ is while worse than them, several tiers below.Anything that gets trapped by dug isn't much of a stallbreaker. Mega Garde is outclassed, and even if it wasn't it'd be questionable in a meta rife with SpD steels.
PZ is mediocre. It only has one chance to sweep due to depending on a Z move, and its Speed tier means it's outsped by basically every scarfed mon. It doesn't have any way to break past its checks like, say, Volcarona does and fails at snowballing. Moreover, it provides little in the way of defensive utility with a shitty typing and mediocre defenses. It's an ok late game cleaner, but definitely not A- or even B+ material lol.
A lot of choice scarf users can outspeed, but they don't OHKO. Choice Scarf Keldeo does a max of 57.8% with hydro pump (and of course is OHKOd by Porygon-z). Tapu Lele does a max of 71.3% in psychic terrain, and Porygon-Z kills (has to be modest to guarantee, but modest is the best nature IMO for it). Choice scarf ground users do well, but they won't OHKO the ghost variant (which again will likely OHKO in return). And once your choice scarf user is down, it becomes very hard to stop. And of course you might have to sack a pokemon to bring in the choice scarf ground landorus/garchomp in safely as it packs ice beam.
Porygon-z really has one solid counter at that's Chansey, and even then takes over 30% damage. But that's typical of every special sweeper pretty much. Volcarona while better, generally has more checks than Porygon-z, bulky water, dragon, fire types, hindered by stealth rock, less powerful than Porygon-z after intial boost. And the fact it gets both special and physical boosts, help it live priority and scarfed hits better.
Porygon-Z is a different type of pokemon, it's more a late game sweeper, and applies pressure on the opponent to keep the one or two checks alive because of it. It's use often forces the opponent to sack at least one pokemon to deal with it which really isn't bad, it usually results in a net win. And normal is a decent typing it's not terrible as it gives porygon the option of a strong z-breakneck blitz and easier type to convert on. Yes something like steel would be better but that's why Magearna is S+, it's better than most typings for special sweepers, Volc's Bug/fire is worse defensive typing. Part of the reason why chansey is so good, as it's weak to just one typing. And while normal isn't great offensive typing, Porygon-Z doesn't exactly stay like that after conversion.
I don't think any of the pokemon in its' own tier for sure, or B tier can compare with the sweeping potential that this pokemon has. And what's more this is a niche, no other pokemon is able to sweep in this way. Even B+ seems to low, those pokemon either require greater support to function IMO and OHKO far fewer pokemon than Porygon-Z does after intial boost and more readily countered. B- is just too low, I think Porygon-Z in the past has been not utilized to it's fullest, most felt it was a one trick pony with Ghost z-type conversion+ 3 attacks. The electric z-type conversion is better and more suited to the metagame and has created the issue where now the opponent has to predict Ghost, electric, or the Z-break neck blitz instead of conversion. The ghost conversion while worse than the electric now IMO will continue to be used because lack of ghost special sweepers, and not much that resists ghost (only competition there is gengar). A pokemon with so many effective options is just far too strong for its' present tier.
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