The gem is on Six Island east of the Pokémon center in long maze. At the end of the maze someone will still it and tell you the password to Team Rocket's hideout on Island 5.
Hes bills friend on island 1
Above cerulean city
go to bills secret garden. use hella max repels trust me this worked. spin in a circle 360 times around the back bottom right corner of the garden. this will only work if you have the itemfinder. then once you spin 360 times use the itemfinder and there you go a mewtrance on Pokemon leafgreen
You must get to the sevii islands, go to four island, you have to bring the ruby and saphire to Bills friend on one island. You can now travel to all the sevii islands. Go to four island, go to icefall cave and find the pike all containing it after a small maze. You can use it on the waterfall outside the cave and find Lorelli, after helpin her you can also battle the elite four again. Hope this helped :)
in bills house...just stay there for 7 hours and he gets anoyed and gives it to you but first you must beat him in a battle..he has an eevee level 100
You will find him on Island 2 in the Eastern House, to complete Bill's request you will need to save Lostelle when Bill's friend tells you of her disappearance, until then he won't accept the item from Bill.
a Pokemon with a long tung
THE POKEMON BILLS FATHER WANTS TO SEE IS LICKYTUNG. THATS THE ONLY ONE I KNOW
No.
somewhere
You can't.
Bills friend Celio is at one island, but another friend is at island 2 in the game corner.