Hi there! :D
So, I'm not really all that great with Gen 4, but I do have a bit of advice for you.
Because you're running a Timid Nature on Porygon-Z, I don't think you really need Hyper Beam. I'm assuming you're using Hyper Beam to deal with Blissey and the likes, but you're only guaranteed a OHKO with a Modest Nature, Adaptability, Nasty Plot boost, etc. So, since you're already forgoing power for other strategic purposes, I think Hidden Power [Fighting] will benefit your Porygon-Z more than Hyper Beam would. HP [Fighting] helps Porygon-Z deal with Rock and Steel types that resist Tri Attack and still gets a super effective hit on Blissey.
For Forretress, I think you should replace Stealth Rock with Rapid Spin. It gives Forretress extra utility in battle and saves your team from entry hazard damage. Also, since you're not using Earthquake to deal with Magnezone, I think the Shed Shell will come in handy.
Rhyperior needs Substitute to help absorb the blows and scout your opponent's attacks / use of Choice items.
And that's all I got. :3 Unfortunately, the raters here can't look at your Pokemon and determine what else should be on your team. So, whenever you have an idea of what other Pokemon you'd like to use, let us know and we will be more than happy to help! c:

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