PokéBase - Pokémon Q&A
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It is found in a house to the top right of the Pokemon Center in Veilstone City. You get it at level 25.

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IN PLATINUM?
Yes in Platinum.
whats the minimum lvl to works up-grade and then dubious disc on him
You can evolve Porygon at any level. You evolve it by trading while it is holding Up-Grade, then again while holding the Dubious Disc.