In the main games, there are no items that lower a Pokemon's level. However in the spin-off, Pokemon Mystery Dungeon, there's an edible item called the Doom Seed which will lower the level of the Pokemon that eats it by 1 level.
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Porygon? It doesn't evolve at a level. You need to trade with a certain item attached to Porygon.
It doesn't evolve from level, you have to give it an item, the razor fang, I think, and level it up at night, any level.
it evolves at level 35 but you might be lucky and get it at a lower level
No, they have lower base stats than a trainer Pokemon of the same level. Pokemon will have a greater base stats on level 100 if they are caught and trained on a lower level.
Porygon doesn't evolve at a level. You need a special item to make it evolve.