over 9000
you can catch as many legendary Pokemon but only once unless you have it on the computer
There are 5. Entei, Suicune, Raikou, Ho-oh, and Lugia.
Moltres is the only legendary Pokemon in Mt. Silver for HeartGold / SoulSilver only.
7 "legendary" Pokemon
I don't now but I believe that you can catch as many as you want when you encounter them.
5
2
The answer is no, dellibird is not a legendary Pokemon. If it is then there wouldn't be some many of them available in the wild and it would be a lot more difficult to catch
If you don't include trades, I think you are able to catch these. Ho-Oh, Lugia, Suicune, Entei, Raikou, Mewtwo and Latias. I have heard that you can catch Groudon/Kyogre (Only one of them, the other one is available on Soul Silver) and Rayquaza, but that I'm not sure of.
all 210 in platinum but you only have to see them
There are many wild Pokemon in Mt. Silver. There is also one legendary Pokemon. If you stick to the left and travel up the waterfall, you will find Moltres.
about 150 Pokemon . Unless you want to count legendary about 160.???????????????? I don't know the exact amount!!!!!!!!!!