1) Technically no
Originally Posted by blackdiamond
2)Yes, there are certain iv combos that are illegal (only for wild pokemon, they don't apply to bred pokemon, and PID's can be checked as well for either)
3)It's not that hard to breed a quintflawless pokemon, I myself have done it quite a few times. Most people on smogon use a method called Rng Abuse
[21:32] <@Kaphotics> Found trash bytes from evo chain Roggenrola, Gigalithe.
[21:32] <@Kaphotics> >>Found trash bytes from Gigalithe.
[21:32] <@Kaphotics> wut