Ho-oh is the pokemon incarnation of a Pheonix, so im sure i don't have to explain.
And as long as Mewtwo is one of a kind, thats all that matters --- NaughtyGhost, my fav person on gamefaqs. Props+forever=http://i697.photobucket.com/albums/vv335/NaughtyGhostGuy/may.jpg http://www.youtube.com/user/Nerwrax15
I assume there is only 1 Giratina as well as Palkia and Dialga since they were directly created by Arceus. For Celebi, I assume that there is only 1, but multiple Celebi's from different timelines can appear at the same time.
I'm not sure about Rayquaza or Ho-oh but there are multiple Lugia's throughout the world. I assume there is only 1 Rayquaza since only one appeared when Deoxys trespassed it's territory during the movie and it was the same Rayquaza that returned to fight Deoxys a second time. But then again in the Manaphy movie 1 was caught by Team Rocket so who knows . --- Diamond FC: 4854 3640 0601