You simply cannot.
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There are Pokémon from Johto in Leaf Green, however you can only find them on the Sevii Islands. (That is after you beat the Elite Four)
He's in Pallet Townn. First you need to beat the Elite Four Johto to go to Kanto.
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.
Pal Park is in Fuchsia City in Kanto. First you have to beat the elite four in Johto, get the S.S. Ticket, and travel to Kanto.in ***** world
No you can't use the azure flute after you beat the elite four