Nope, I always use the cover legendaries the first chance I get, and they usually stay on my team until I wish to switch them with another legendary. --- I only play in Ubers R~married to Shauntal and Lorelei/Prima
Let me just hope that we are not forced to catch them and have them in my team. If we are, then I won't advance to that point and stay away from the place. Thus, it would be rather silly if anybody saw me just walking around the starting town without defeating the Elite Four with 6 level 100 pokemon.
I HATE having legendaries on my team for any amount of time. I do catch legendaries, but that was way back when you could actually catch more than 1% of legendaries in-game. After I catch them I go to the Pokemon Center and move the legendary to the last box titled "Trophies" and never touch them again. --- I loathe Gen V. I am being optimistic for Gen VI, because I hope they can make a good new feature.
Boxed for purity. I like keeping my legends untouched, so that I can display them proudly and have potential trade bait. In the event that it's worth training, I will take it out post-game and EV train it. That's how I've been doing things recently. --- The Official Luigi of the Super Smash Bros. Wii U Boards