Ideally, these are the options.
UNELASHED can help increase Free T anytime -- much like proviron. So it can be used anytime. You tend to "feel" it more PCT because that's the time you need the most help. It's nice to have a sex drive while coming off.
POST CYCLE is just as it states, though a lot of guys who use orals are using it while on for the liver protection. POST CYCLE is the most dramatic in terms of improving erectile function too.
HCGenerate, is like a mild HCG cycle, so again, great for PCT, but make actually help DURING the cycle. In fact, it can act like a low dose shot of HCG to avoid total shutdown of LH while on. It also acts nicely in between cycles to keep LH high.
So there's really no "wrong" way to use any of them. It depends on your particular needs.