You can only either look on youtube for cheats on how to clone pokemon on wifi or put a ditto from the mans trophy garden and a starter pokemon from the start of the game with it in the day care.
You can either trade or breed them with ditto or use a cheat
Well, you could always get emerald then get the navel ticket, and import lugia
You can not catch them you have to have accion replay or start with one of them or trade
You can't catch them ,you can only begin with one out of the three. Maybe your friend has a ditto and must of mutiply one of his\her beginer pokemon\pokemons.