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Yeah...
gts
you cant privately swap numbers and trade but you can trade a Pokemon for a lugia
You can get it in GTS or trade it from Silver or Gold
you catch lugia in whirl islands in soulsilver
yes, if someone's offering one in exchange for another Pokemon
you cant
they have to be on ur pokedex
what is luiga and what is planium?for lugia you cheat get an event migrate or trade or do GTS
You cant
Yes u can, If u put a Pokemon in GTS You can still seek for Pokemon.
wrong you can