go to the day care center and this might sound crazy but put a diddo in the day care center with an uxie or azelf or mesiert.and wait a week and then you will find a mew or mewtwo!
Yes you can catch them at the Spear Pillar.
by going to the spear pillar after you get the national pokedex
If You Meant To Catch To Mew,No.
No, you cannot catch a mew in Pokemon Platinum without cheating.
You cant catch mew.
You can't get mew in firered or leafgreen.
there no cheat to catch mew in pokemon ruby
a
no
Pokemon pearl
there is a mew in Pokemon soulsilver but you need to catch all leadndery Pokemon including event Pokemon
You need to trade Mew from Emerald