You can use Action Replay (it's easier to use an emulator I guess) to clone your pokemon. You can probably do it with anyone.
Mewtwo can be found in the Cerulean Cave in HeartGold.
There is no such thing as "island two" in HeartGold. There are two islands in the game. Those islands include the Seafoam Islands and Cinnibar Island. None of them, however, are labeled "island two."
you can get it by getting a pichichu in pearl trade it to heartgold
At one time, no.
Mt.Moon
You catch Mew-Two
there is only two regins.
Just use an ultra ball or two.
duh.there two defrent games
Battle your rival, find two clefary's and a home
The two games are essentially the same difficulty. The only major difference is that in HeartGold, you can catch Kyogre, while in SoulSilver, you can catch Groudon.
Catch a pikachu two times and breed them together