one of the scientist in the galactic warehouse.
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An Up-Grade is an item that evolves the Pokemon Porygon when Porygon is traded while holding it. Porygon evolves into Porygon 2.
At route 216 just by the exit of mount cornet there is an ace trainer who used an ambipom. Also, if you haven't found a Porygon-2 yet, he uses one of them too
In Pokemon Platinum, Porygon-2 can evolve into Porygon-Z using the Up-Grade. I do not believe it serves any other purposes.
In Pokemon Platinum (I don't know about Diamond and Pearl), Porygon is located in a house directly behind the Pokemon Center. If you want to evolve into Porygon 2, trade it holding a Up-Grade, and if you want to evolve Porygon 2 into Porygon Z, trade it holding a Dubious Disk. I do not know where htese items are found. If you want to get Porygon the harder way, use Pokecheck.
That Pokemon is Porygon 2. There are two trainers who have him, although you may have already gotten past the Scientist in the Galactic HQ. The other one can be found on Route 216. That is one of the Snowy Routes. The trainer is Ace Trainer Blake.