ULTIMATE MARVEL VS CAPCOM 3

To perform a Team Aerial Combo, you must hit the A button (special attack) and it will knock the opponent into the air. Follow them into the air (Up direction) and do a combo, ending with pressing A again +any direction (A simple combo would be, to knock them in the air, then hit them with any normal attack then A+any direction) It will then bring in your next character and you can continue the combo in that fashion.

Now, to COUNTER a Team Aerial Combo, you need to be HIT by a Team Aerial Combo, and when they go to bring the next character in (Easily noted by the light that appears) you have to guess which direction they chose by pressing the same direction+A. If you guessed correctly, you'll counter the combo and you'll both fall to the ground.

Do this 30 times and you're done.

Easily boosted with a friend on Player Matches if you're having troubles.