Under number 276? Or do you mean, where can you catch a
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On the national pokedex Groudon is number 383.You can not find Groudon on the Sinnoh pokedex.
Eevee's number in the national Pokedex is #133. If you don't know what the Pokemon's number is then go to pokemondb.net/pokedex/national It is a great site to find Pokemon's number!!
Alright actually you can get Cranidos in pearl. All you need is the national pokedex. Go back to the underground until you find the fossil but you do need the national pokedex to find it.
if you meen the national dex then you need to find every Pokemon in the sinnoh pokedex
I believe you meet him after completing the Sinnoh Pokedex. Then he will update your pokedex to national.