for example,you get a Torchic from the professor,then you must ensure this pokemon is in your team before you enter the petalburg woods.do you choose a female character?you can use pkhex to check the real sex.
1.people play the 721just because it is a cracked rom.yeah,because of laziness.the same bugs exist.
2.get the rom is not difficult.but i think sharing is illegal on this forum.
3.just use the lastest one.sse or avx?test it youself.people get different results.