No this item only works if you actually use it if your Pokemon is holding the revival herb it will not revive when it faints.
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that Pokemon gets half of his HP back What ever Pokemon you give it to, ittle bring them back alive with half HP
go into the underground, that's were you will find any fossil Pokemon. except on diamond, you cannot get a shieldon or lileap. those are only found on pearl. then go to the oreburgh museum and give your fossils to the professor and he will revive them!
In oreburgh city in the mining museum there is a guy in a lab coat standing behind the counter. Talk to him. He will start going on and on about how he can revive your fossils, and then you choose a fossil from the list that pops up of the fossils you have. He will say go away and come back later. Walk out the door, make sure you have an open spot in your Pokemon party and go back in. Talk to him again. He will again start going on about how you are late and he had to wait for you. Eventually he will give you the Pokemon that the fossil had.
There is a lab on Cinnibar Island which has a machine that can revive the fossils. To reach the island you must have Surf and the Soul Badge from Fuchsia City's gym and once you have both items go to Pallet Town and surf on the water below and keep going down until you reach the island. Once on the island locate the Pokemon Center and directly to the left is the lab where you can bring your fossils. Inside the lab go into the last room on the right and speak to the scientist by the machine and give him your fossil and he will make it come to life however it will take awhile he asks you to walk awhile so leave the lab and enter it again and speak with him once more and he will give you the revived pokemon.
Simple, you can revive it by going inside the museum (where the gym is) then talk to the lady in the near to the entrance (the one infront of the other door) give her your fossil and it will get revived