I assume the thread is about Legendaries that were introduced in 3rd gen?
My most favorite would be Rayquaza, followed by Groudon, all the others' designs just suck imo, I mean look at the Regis... Also I dunno why I feel that Jirachi is like the deformed brother of Victini, he was the first to have these "ribbons" made of flesh before Ninfia made it cool
And Rayquaza actually had a job, instead of fighting like them d-bags Groudon & Kyogre he stops their cockfight & puts them where they belong! Also he's the first ever Dragon legendary! More points for Ray