Imo it depends the way you breed (sorry for bad english)
if you want 31's comps/breeders etc etc i would recommend you to catch them.
If you want poverty comps/breeders etc etc, i would buy on gtl.
Hello I want some comps :P
Everything should have 31 speed and 25+ all (expect hidden power pokemons)
Only lvl50 comps (dont ask why)
Pm me ingame or forums or whatever
Ign: Brunie
OU Wishlist (big wall of text, warning XD)
LF offers on this one :) IGN: Brunie
Nature Modest
Selling in 48h-72h if no more bids are made
Best offers so far:
5.2m Phinminch (something like that)
6m ironfat