If I use juke, am I considered to be flanking the creature with myself? For example, can I use Juke to gain the benefits of Outflank with myself?
When an opponent charges you, you gain a +4 dodge bonus to your AC. If the charger's attack roll misses you and his movement ends while he is adjacent to you, you can switch places with the opponent as an immediate action, and he is considered to be flanked by you until the end of your next turn. You can't use the benefits of Juke if you ready an action to set a weapon with the brace special quality against a charging foe.
Whenever you and an ally who also has this feat are flanking the same creature, your flanking bonus on attack rolls increases to +4. In addition, whenever you score a critical hit against the flanked creature, it provokes an attack of opportunity from your ally.
I am going to guess, as a general rule, that you can't trigger the outflank AoOs for yourself.
Because that seems like it could potentially lead to a chain of crits if you have a high crit weapon like a scimitar or rapier. You have roughly a 1% chance to get in 4 hits on a keen one, assuming the confirmations all go well.
What about the +4 flanking bonus vs the +2? Am I flanking with myself?