It is not possible to answer the question because the basic premise is incorrect. Xenon is NOT the rarest gas.
There is no real data to tell us what the rarest marine fish is. Likely the rarest fish has not yet been discovered, because it is so rare.
The black apple is the rarest silly band because hardly any are ever made.
Element, because it is the rarest
The answer isn't Lugia.Answerno its not lugia because you can get it without cheating on soul silver so i think Arceas or MEW is the rarest
shaymin isn't the rarest Pokemon deoxys is the official rarest Pokemon but its realy arceus I Know arceus is the best but beside is actually raquaza C lv x! Because t does 200 f@*%$# damage!
It's the rarest mythical creature because no one ever heard of it.
it is the rarest animal in the world which is easy to tell because it is the dog hardest to find right so look up what the rarest dog in the world
mew2 is the rarest
rarest eye color is GREEN
you cant find the rarest silly band in stores or on line because the rarest one in America is the 2 foot limo. an employee got mixed up and instead of a 2 inch limo he made a 2 foot limo
Lemme Give U The Answer To That.... ITS NOT THE RAREST FLOWER EVER SO STHU BECAUSE THE BLUE TULIPS TALK AND THEIR GAY!