Assault Vest
Porygon-Z @ Assault Vest
Ability: Analytic
EVs: 252 HP / 252 SpA / 6 SpD
Modest Nature
- Tri Attack
- Shadow Ball / Dark Pulse
- Thunderbolt
- Ice Beam
Tanky Porygon-Z! Thanks to Analytic and its only decent 90 base speed to let it get outsped by other Pokemon, all of its moves have 1.3x power. Well, this set might be more suitable for Porygon2 with eviolite, but Porygon-Z has a higher Sp. Atk stat to back it up. Tri Attack is STAB, Shadow Ball hits ghost types pretty well, and T-bolt/Ice Beam for the BoltBeam coverage. Dark Pulse can be used over Shadow Ball, but I don't think it really matters.
Physical Set?
Porygon-Z @ Normalium Z
Ability: Adaptability
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant / Jolly Nature
- Sharpen
- Last Resort
Yeah, don't use this fella on a serious team. Z-Sharpen gives it two attack boosts, making it a one-time swords dance. Last Resort, with adaptability, is a 280 BP move. You can also add Agility in there as well if you use an adamant nature. Keep in mind that this set isn't a good one, and is most likely going to fail with that 80 base attack. Oh yeah and it's going to get walled by ghost types easily. The only good thing about this set is the fact that it's very unpredictable.