Bug Catching contests at national Park.
You have a 5% chance of seeing one at night, 10% during the day, and 15% in the morning.
Before you get the national dex, they are found at levels 13 and 14.
After you get the National dex, they can be found at level 27 and 28.
in route 37
You can get Phanpy only through trade in Soul Sliver, but for players that have Heart Gold, you can find Phanpy at Route 45, and Mt. Sliver.
In the Pyrenese Mountains
he is not in there latios is instead
Scyther can be found at the National Park during the bug catching contest. It's very rare to find a Scyther though (about a 5% chance). Google, my friend.
Victory road and mt. silver
You will not find mew unless you have a action replay.
you dont make poffins in soul sliver
you canot find him in white only in soul sliver or trading
Kanto, the fourth time you meet it.
Safari Zone(rare)
No where. You see him and face him only once.