Answer 1

To get Mewtwo, you must use Pal Park to transfer it. Mew is the same, although you are also able to transfer it from My Pokemon Ranch, which is a WiiWare. To get the Mew, you must have 999 Pokemon on the ranch.

Comments

Then trade her an egg. I was surprised that she wanted any egg, but she did.

Answer 2

Only through pal park and trade.

Answer 3

If you mean Encounter then NO!!