Graveler does not use an item to evolve. It evolves by being traded to someone else, meaning that you will need at least two game cartridges and consoles and a way to link them together. The same goes for Haunter, Machoke, and Kadabra.
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From the top of my head, I can think of graveler, kadabra, machoke, haunter, onix(need item), scyther(needs item), clamperl(needs deepseatooth or deepseascale), porygon(needs item), porygon2(needs item), magmar(needs item), electabuzz(needs item), I think there are more, but that's all I can think of.
The Oval Stone is an item in the Pokemon games which can be used to evolve certain Pokemon. For example, it can evolve Chansey.
Porygon doesn't evolve at a level. You need a special item to make it evolve.
well that depnds on what Pokemon you are talking about. they all evolve at different levelsPokemon can be evolved in many different ways. Most Pokemon evolve when they reach a certain level. Some other Pokemon evolve when an item is used on them.
I don't believe so... It can evolve when holding an item if you trade it to someone else, it doesn't matter which game you trade it on.