Raising them from birth does give you a better chance of raising them 'right.' On the other hand, wild Pokémon do have survival experience that a hand-raised Pokémon might lack. My closest Pokémon was caught wild and the one that wants to kill me came from an egg... but I've also caught Pokémon with stoic and violent streaks and raised overly affectionate metal bugs.

[Heh.]

You could argue nature vs nurture all you want, but every Pokémon's gonna be different regardless of where they come from. Grabbing them from eggs just gives you the added advantage of shaping them while they grow. That, and they won't have to leave their homes behind.

[Well, that was more longwinded than he expected, but since she asked about his guide...]

And yeah, I wrote it all up on my own.