The fact that people are saying shiny Charizard, Rayquaza, and Luxray are best makes me really happy.
I have all three (and many others). Bes part is, I got them all myself, and they each have rather good natures (Timid Charizard, Jolly Rayquaza, Adamant Luxray). Of course, their IVs could be better...
Mew is a cool shiny. Camerupt is awesome as well. Oh, yeah, and Ninetales, too.