AN SMA INSTRUCTOR PLT HAD AN NMAC EVENT WITH AN MLG ACR AND ANOTHER SMA. THE RPTR SMA MADE EVASIVE ACTIONS WHILE THE MLG DID NOT. THE ACR MLG HAD TCASII. ATC ISSUED A TA REGARDING THE RPTR ACFT AND THE MLG BUT APPARENTLY DID NOT SEE THE OTHER SMA.

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CONTACTED ONTARIO APCH FOR RADAR ADVISORIES. FLT FOLLOWING WAS GIVEN. DEPARTED PDZ VORTAC TO INTERCEPT POM VORTAC 290 DEG RADIAL. WHEN TRACKING TO POM AT 4500; APCH CALLS TFC AT MY 2 O'CLOCK POS AT 4000. HE ASKED US TO RPT TFC IN SIGHT. MY STUDENT RPTS TFC IN SIGHT AND PROMPTLY POINTS UPWARDS TO A SEBOUND SMA. PRIOR TO MY STUDENT RESPONDING TO APCH; I HAD ADVISED HIM TO SAY TO THE CTLR THAT HE WAS LOOKING BECAUSE I DID NOT SEE TFC. AFTER MY STUDENT POINTED TO THE SMA; I SAID TO HIM NO; OUR TFC IS BELOW AND TO OUR R. I PROMPTLY TOOK THE CTLS AND RAISED THE R WING TO SEE AN ACR MLG OFF OUR R SIDE. WHILE THIS EVENT WAS HAPPENING; THE CTLR INSTRUCTED US TO MAINTAIN VISUAL SEPARATION. THERE WAS NO TIME TO PICK UP THE MICROPHONE AND TELL THE CTLR IT WAS THE WRONG TFC WE HAD SEEN. THE MLG APPEARED TO BE CLBING TO A COLLISION POINT WITH US. SO I TOOK THE CTLS AND MADE A STEEP R TURN TO AVOID TFC. I KEPT TFC IN MY SIGHT AT ALL TIMES. IT WAS DURING THIS TURN I ESTIMATED I LOST ABOUT 3-400 FT TO AVOID THE MLG. AS I PASSED OFF THE WINGTIP OF THE MLG; THE CAPT MADE A STATEMENT THAT HIS TCASII SYS INDICATED THAT I WAS AT 4000; ALTHOUGH NO EVASIVE ACTION WAS TAKEN BY THE MLG. APCH THEN QUESTIONED ME AND ASKED MY ALT AND WHEN I LOOKED AT MY ALTIMETER IT SAID 4300 FT. THIS IS WHAT I RPTED TO HIM. HE THEN TOLD ME THAT I WAS INSTRUCTED TO MAINTAIN 4500. I THEN TOLD THE CTLR THAT I HAD TO MAKE A STEEP TURN TO AVOID MLG. I ALSO REMEMBER TELLING HIM THAT MY STUDENT SAW THE WRONG TFC. IN MY OPINION WHEN I SAW THE MLG FOR THE FIRST TIME I THOUGHT I WAS GOING TO HIT IT. EVEN THOUGH IT WAS 500 FT BELOW ME; I TOOK EVASIVE ACTION TO AVOID IT. I THINK BACK NOW AND REALIZE THAT IF I HAD JUST CONTINUED ON; HE PROBABLY WOULD HAVE PASSED BELOW ME. ANOTHER FACTOR WAS THAT THE CTLR'S VOICE RAISED TO A QUICKENED PACE WHEN HE SAW THE TFC MERGING. THERE WAS NOT ENOUGH TIME TO RESPOND; MUCH LESS TO LOOK FOR TFC. 1) I WAS AT FAULT BECAUSE I LOST ALT IN A STEEP TURN TO AVOID TFC. 2) THE CTLR CALLED TFC TOO LATE AND TARGETS WERE TOO CLOSE; BETTER SEPARATION COULD HAVE BEEN PROVIDED. 3) CAPT OF MLG HAD TCASII SYS BUT NEVER MOVED AN INCH TO AVOID ME. I SAW NO MOVEMENT OF HIS WINGS THROUGHOUT THIS EVENT.