After receiving the National Pokedex and the radio card from the radio tower in Lavender Town you will get the Hoenn Sound which is only available on Wednesdays, and the Sinnoh Sound which is only available on Thursdays.
You can find Pokemon from the Heonn Region and after you beat the elite four and go to Professor Birch for your Pokedex update, you can find Pokemon from different regions in the earlier games.
Tune in your radio card in Wednesdays to find hoenn Pokemon in the grass.
route 29 hoenn sound
You can't find Mew in Pokemon Silver.
there is not a secretpotion in Pokemon silver Daniel robertson
There are 2 special shows on the radio: The Hoenn sound and Sinnoh sound. These shows are only available on the Pokemon Music Channel once you have defeated Red at Mt. Silver. On Wednesdays, the Pokemon Music Channel will air the Hoenn Sound. With this sound playing, walk around to find Pokemon that can be from the Hoenn Region.
You find Moltres in Mt. Silver.
You can find combee on some Sinnoh pokewalker routes, and in some places using Sinnoh sound.
You don't find it. You find larvitar, which is located at Mt. Silver.
to find out how to catch teddiursa in Pokemon silver... YOU CAN'T IDIOT
You can't find Mew in Pokémon Silver.
in Pokemon soul silver you will find it (it is not in the grass)