According to the gallery section in the PokéGym, #27 is Tropical Tidal Wave. Flip a coin. If heads, discard all of your opponent's trainer cards in play. If tails, discard all of your trainer cards in play.
As far as I know, this rare card was only released at the Worlds 2005 Championship. Another card that was released at Worlds, #28, is Championship Arena. It is a Stadium card. At the end of a player's turn, if they have more than 7 cards in their hand, they must discard cards until they have 7 cards in their hand.
Promos #29 and #30 are a reprinted Celebi from the one released at Pokémon 4ever, and a 3rd reprint of Suicune from Aquapolis. The rest of the promo cards are the legendary birds from the tins.