I want to make an effective 15th-level combat eidolon that dominates the battlefield with Combat Patrol. Sadly I'm not familiar enough with this feat that I feel I could put an effective build together.
Please help.
EDIT: The summoner hasn't been built yet either (25-pt. buy), so if you think archetypes are a way of making the feat work, that's fine.
I would avoid the archetypes and stick with the standard version of the Summoner since you obviously want to put everything you can into your eidolon. Start with the biped base form, take the Reach evolution for your claw attacks, take the enhanced version of the Large evolution to make your eidolon Huge, and have your Summoner take the Extra Evolution feat as often as possible to get as many available points as you can. There will be very few foes on the battlefield that your eidolon cannot reach, unless you are fighting in a confined area.
If you expect a lot of your fights to be in areas where a Huge eidolon won't fit, you may want to reduce the Large evolution to its basic form. Few adventures take place in hallways so narrow that Medium creatures have to squeeze, so at worst your Large eidolon would have to squeeze while the rest of the party can move normally.
Of course, by the time you can make your eidolon Huge, you will be able to cast Summon Eidolon several times per day -- and between that and your Transposition ability you should be able to get your eidolon into any area where a normal sized party would be able to fight.