The Transporter Card is what Masquerade (and later Alice Gehabich) used to teleport around the world. It is able to travel anywhere on Earth and even to the Doom Dimension, but can not travel to New Vestroia or Vestal. This was also used by the Top Ranked Brawlers, but were discarded after severing ties with Masquerade. After Masquerade disappears, Alice uses this card to aid the Brawlers when needed.
Alice used it in Bakugan Battle Brawlers: New Vestroia when Spectra Phantom, Gus Grav, and Lync Volan came through the portal to Earth from her grandfather's lab.
In Bakugan Battle Brawlers: Mechtanium Surge, Worton makes a reference to this card.