I usually use Metagross when I've got the Beldum in Emerald, and I sometimes use Dragonite. That's about it, really.

If you've got the pseudos because of types then I guess it's fine, but if you're getting pseudos just to say "HEY I'VE GOT A PSEUDO TEAM LOLOL" then I'd probably say no.

I rarely use them, mainly because they are bitches to train and evolve (besides Garchomp, who i use every other game in Platinum).

Dragonite, Tyrannitar, Metagross, Salamance, Garchomp, and Hidregion are the only Pseudo-Legendary pokemon. Y'know, the strongest in their region, save for legendaries?

then again, having Soul Silver (and played the Old Silver) if you have Lugia in your party for the Elite 4, omg he kicks ass! Flying Psychic, Koga and Bruno have NO CHANCE!

with the exception of Salamance (awesome dragon/flying type and learns a lot of fire type moves) I don't use any of those, nor got any of those :P. I prefer common types too, cuz I only have used 1 legendary to battle with for a while as well, Rayquaza, other than that, for some reason, I feel it's more satisfying and challenging to beat a Pokemon game with NO Legendaries and/or Pseudo-Legendaries except Black and White because you have to have those Legendaries to battle N with...

before i knew all about pokemon stats and competivtive battling, tyranitar was always my favorite