I been wondering which is the rarest Pokemon , and I don't mean like o yeah I got Lugia or so , I mean like event Pokemons that's nobody have and so
>>32445341
>nobody has
Legitimately no one has Marshadow yet, I think, maybe there was already an event in Japan. Other than that there are no unobtainable Pokémon.
>>32445373
Alternatively, a legit Surf Pikachu/Raichu
Wish Chansey
Shiny Victini/Celebi
AZ's Floette
>>32445341
Nothing because everything can be injected
Speaking in terms of having the fewest legit event distributions, I think it would be Celebi. At least it's the one I've heard the fewest about in the years since Gen 2.