This is actually way easier than it sounds, this will only take 1-2 tries to achieve. Make sure to equip the "Bubbles" trail.
Simply start a 1v1 exhibition matchon on "AquaDome" without bots. Then run the ball into the wall so it gets into the air. Quickly ride over the wall and hit it so it says "aerial hit."
Then quickly press start and switch over to the other team. Drive the ball into the goal as the other team. The game will still register it as an aerial goal. Trophy should unlock now.
If this guide wasn't clear enough, here's a video another player put on youtube: