First, get the silver feather from the radio tower after saving it (SoulSilver) or from the man next to the Pewter PKMN Dept. store. Then go to whirl islands to confront Lugia.
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Summon Lugia with it at @ Whirl Islands Ancient Chamber
Yes, in HeartGold, the Silver Wing item to summon Lugia is given to you by someone in Pewter City in Kanto, and you can only reach Kanto after defeating the Johto Elite Four.
No, a Synchro Summon is a kind of Special Summon.
A tribute summon is a form of Normal Summon. So that means you can only tribute summon OR normal summon ONCE per turn.
Not quite. A Synchro Summon is a Special Summon. A Tribute Summon is the same as a Normal Summon, except that when you Tribute Summon you need to tribute monsters. Also you can Special Summon as many times as you want to in a turn, whereas you can only Normal Summon OR Tribute Summon once per turn, except with a card effect.