Tis true. Makes it so not only can you make a mistake like that and not have to start over or trade with someone, but also makes the legendary Pokemon potential training fodder xD
IMO, Red is better training fodder. Highest trainer in the game, with pokemon Lv70-80.
But yes, if you feel so inclined, you could use legendaries as training fodder.
Anyway, I don't know about tournaments or whatnot, but presuming I attend, I'll most likely bring my DS with some or all of my pokemon games, and probably one or two of my PSPs.