Eh? Mt Silver has the same as anywhere else. The reason lots are found there is because it's the best training place in the game as it has the highest leveled pokemon. Lots of trainers train there for long periods of time thus the encounter rate is higher.
BUT the odds are still1/8192
Anyway I'm positng because i got a lovely shiny bird.
My second SR'd pokemon and my Third Legendary... Although one of them was traded for. SO it's technically my Second caught Legendary aswell!
The syncroniser worked, Rat used Endeavor, Ho-oh used Sacred Fire, both at 1 HP Rat got burned and fainted.
Gengar missed twice with Hypnosis, Ho-oh used two Punishments on it, Gengar fainted.
Lanturn out, Revived Gengar and healed while Ho-oh attacked Lanturn, Ho-oh used Safeguard so i just keep throwing balls.
Lanturn down to 7 HP and the Dusk ball Clicks shut on Ho-oh.
So lucky!