POTENTIAL CONFLICT AVOIDED AS SMA PERFORMS EVASIVE ACTION CLB.

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I DEPARTED DAYTON MORAINE WBOUND CLBING TO 3000 FT MSL. MY CRUISE HDG WOULD BE 315 DEGS; HOWEVER; I WENT W SO I COULD CROSS THE RWY 6 LOC (DAY) SEVERAL MI OUT. I WAS 4-6 MI OUTSIDE OF THE DAY ARSA AT ALL TIMES; WHEN ABOUT 8 MI W OF MORAINE; I TURNED TO 315 DEGS. I WAS ON 122.7 WITH DAY APCH IN THE STANDBY FREQ. AS I GOT ON THE LOC TO CROSS IT; I SAW A LARGE ACFT 15 DEGS TO THE R OF MY NOSE AND SAME ALT (3000 FT). AS I KNEW HE WAS TRACKING OR INTERCEPTING THE LOC; I CLBED AND TURNED L TO 270 DEGS. OTHER ACFT PASSED BELOW AND TO R. AS I TURNED; I BROUGHT UP DAY APCH. I HEARD THE CTLR TELL THE MLG HE WENT THROUGH THE LOC. THE MLG SAID HE WAS WATCHING THE 'LITTLE GUY' AND MISSED THE LOC. I SAW AND AVOIDED THE OTHER ACFT SAFELY. IF I HAD THE APCH CTL FREQ ACTIVE; I WOULD HAVE KNOWN HIS LOCATION BEFORE I SAW HIM. I SUSPECT THE OTHER ACFT WAS ON A TRAINING FLT AS IT WAS SEVERE CLR AND HE WAS INTERCEPTING THE LOC 14 MI OUT WHEN YOU COULD SEE THE ARPT 50 MI OUT. THIS IS A CAT II APCH; WITH THE OTHER ACFT FLYING A MISSED APCH. WHY WOULD AN ACR BE 2900-3000 FT WHEN 14 1/2 MI FROM THE ARPT IN A HIGH DENSITY GA ENVIRONMENT? THE OTHER ACFT DID NOT HAVE HIS APCH OR LNDG LIGHTS ON; WHICH MADE IT HARDER TO SEE HIM. I SUSPECT THE OTHER ACFT ENTERED THE ARSA AT OR BELOW THE 2400 FLOOR AT ITS OUTER RING. WHEN I WAS INBOUND TO MORAINE; THE DAYTON TFC WAS ONLY CLRED DOWN TO 4000 FT IN THIS AREA. ALL ACFT SHOULD HAVE LIGHTS ON IN HIGH TFC AREAS.