Nope......They're rivals since they both are opposite type Pokemon and they both are strong birds.
Eg:Kyogre and Groudon-Both are not related but are considered rivals and are both opposite types.
Hope My Answer Meant Something......:]
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You bet
yes you can. but if you have Pokemon soulsilver, the first encounter will be a lugia and vice versa for ho-oh.
lugia
no
the fog badge and the rainbow wing