You need to take a Pokemon with you that knows the move 'Whirlpool' and 'Surf' then you have to surf around the side of the Shrine and use Whirlpool, then continue Surfing and go through the doors into the Shrine
Hope This Helped
DidYouKnowImStupid
Sources:
The Game
I think you have to beat Claire then meet her inside dragons den
you have to have surf and wirlpool but it is in back of blackthorn city's gym but you have to have beat the gym leader first to go in and find the dragons den
Lugia
You can find your Rival in the Dragon's Dens on Tuesdays and Thursdays but only after he has teamed up with you in a Double Battle against Clair and Lance. For additional information, please see the Related Link down below.
With the introduction of Pokemon Silver, 150 new Pokemon were made available. These, however, are only the Johto region Pokemon. All Kanto region Pokemon are also available in Pokemon Silver, bringing the total available Pokemon up to 251. Edit: Only 100 new Pokemon were introduced in Pokemon G/S/C.
werhe can you play pokemon silver online with saves
Groudon cannot be caught in Pokemon Silver. Groudon was introduced in Ruby/Sapphire/Emerald, which came out after Silver.
ice and dragon
you can get a drangon scale buy going to the big lake and defeat red grydoes (sorry if misspelled)
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answer the ones which show your friends with your Pokemon
Odonata
Pokemon cannot learn Yawn in Pokemon Silver.
you can get celebi from a Pokemon silver event
Lugia
its the silver apercorn in Pokemon silver and its the gold apercorn in Pokemon gold
You can't find Mew in Pokemon Silver.
there isn't venasaur in Pokemon silver you have to trade it
How do you get to goldenrod city in pokemon silver?