It's quite fun, however, also a bit annoying, at least with Virizion and Tornadus. Virizion because she has Giga Drain and Tornadus because he keeps flying away.
I was quite lucky with Victini and Cobalion, caught them with one throw. I also caught Reshiram in one throw, but that isn't really an archievement, it has an higher catch rate than a Chatot.
Hmmm, yeah, a heal ball is kinda the same as a Premier ball, they both have a catch rate as of a normal Pokéball.
Hehe, your welcome, I just like to help people^_^