It's easiest to first use a Rock then use a Safari Ball afterward however the more rare a pokemon is the more likely it will flee after the rock is used.
I recommend using as many Safari Balls as possible especially on the more rare pokemon like Chansey.
You can catch pinser in the safari zone.
in the safari zone or you can buy it at the game corner
you can't it should be in the safari zone
Safari Zone Area 2 (1%)
you need to find it in the safari zone in area1.
The safari zone has chansey. But they're pretty tough to catch there.
At the safari zone (area 1 and 3) and it's rare.
You can catch one in Pokemon Firered and Leafgreen. But you can only catch one in the safari zone or you buy in celedon city
safari zone
safari zone
Go to Fuschia city and there is a Safari zone.
Go to the Safari Zone. Use a Good Rod to find one.