depends:for example if one's level is higher than the other the first ones power will be greater.Also ho oh is a fire and flying type VS. Rayuaza a flying and dragon,iv'e done research and fire's power is weaker against dragon. so i think Rayuaza will win.(ps:rayuaza lives in the ozone and barely comes down)(one last thing rayqaza is spelled r-a-y-q-u-a-z-a
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figuire it out yourself
You bet
the fog badge and the rainbow wing
yes you can. but if you have Pokemon soulsilver, the first encounter will be a lugia and vice versa for ho-oh.
in the tin tower but you need rainbow wing in kanto region then you get it from this old guy, the tin tower is near the burnt tower