Is it possible to trade from pokemon sliver to pokemon diamond? If so how do you do it?
No, since you can't put a GBC (gameboy color) game card into a nintendo DS, you can't however I'm not sure if it's possibly to trade into a GBA game, but if you can, you can trade it into maybe a pokemon fire red, leaf green or emerald, and if that's possible you can indeed trade it to diamond or pearl, but this all revolves around whether or not you can trade from a GBC game to a GBA game
No, it is not possible whatsoever. Silver is only GBC compatible, and so cannot migrate to the more modern Pokemon games. The only ones able to migrate are pokemon Leaf Green, Fire Red, Ruby, Sapphire and Emerald.