The Pokémon TCG: HS Unleashed expansion was released on May 12th, 2010. Press release pictures from this set have been added to an Imageboard thread.

Pokémon TCG: HS Unleashed

Raikou... Entei... Suicune... Alone, each of these Legendary Pokémon is a force to be reckoned with, but let loose in pairs, they become amazing LEGEND cards! In the Pokémon Trading Card Game: HS—Unleashed expansion, you'll find Pokémon Prime bursting at the seams, powerful Pokémon like Jirachi and Shaymin raring to join the battle, and Pokémon LEGENDs joining forces for twice the excitement! Are you a powerful enough Trainer to command what's been Unleashed?

With more than 90 cards, the brand-new Pokémon TCG: HS—Unleashed expansion is available now in stores nationwide.


Features of the new Pokémon TCG: HS—Unleashed expansion:

• Legendary Pokémon—Entei, Raikou, and Suicune—appear in pairs on Pokémon LEGEND cards
• Discover six amazing Pokémon Prime cards, including Tyranitar and Steelix!
• Introduction of Chaos Control and Steel Sentinel theme decks

Twice as Nice
When you play the Pokémon LEGEND cards in the Pokémon TCG: HS—Unleashed expansion, your opponents will find their troubles doubled! Each Pokémon LEGEND pairing features two of Raikou, Entei, and Suicune. In addition, each of the card pairs features two types, two Weaknesses, and incredible attacks and abilities that could turn the tide of battle in your favor! These magnificent cards are completed by stunning artwork, making them even more desirable. So, start collecting them all now!

Prime Suspects
The Pokémon Prime in HS—Unleashed offer great tactical value to any deck. Check out Kingdra Prime and its Spray Splash Poké-Power, capable of damaging your opponent every turn without leaving your Bench! Take an even closer look at Lanturn Prime, a Lightning-type Pokémon that can become a Water Pokémon with its Underwater Dive Poké-Power. And, if offense is what you need, hammer the Defending Pokémon with Steelix Prime's Gaia Crush—a 100-damage attack that also lets you discard any Stadium card in play. With a total of six Pokémon Prime in the expansion, it will be no time at all before you discover just how much they can help your deck!

Seek Some Support
HS—Unleashed contains several fascinating Supporter cards that cycle cards in and out of your hand. Want to shake things up a bit, or throw your opponent's plans into disarray? All rise for the Judge Supporter card, which forces each player to shuffle his or her hand into his or her deck and draw 4 new cards. Or, if your hand needs some tweaking, play Engineer's Adjustments—allowing you to discard an Energy card and then draw 4 new cards from your deck! If it's Energy you're hunting for, pay attention to the Interviewer's Questions. When you play it, you’ll be able to keep any Energy cards you may find among the top 8 cards in your deck before shuffling the rest back in. You’re never without backup HS—Unleashed!

Source: https://www.pokemon.com/us/pokemon-tcg/hs-unleashed

Chaos Control / Steel Sentinel Theme Decks

The chaotic powers that have been unleashed can only be controlled by an amazing Pokémon Trainer. Is it you? In the Chaos Control theme deck, you'll need to balance devastating attacks like Tyranitar's Tail Crush and Lucario's Bulk Up against more strategic approaches like Mismagius's Psychic Pulse. With all of your opponent's Pokémon vulnerable to your battle plans, can you control your forces until victory is yours?

The best offense is a strong defense when you play the Steel Sentinel theme deck! Steelix's Guard Press attack reduces the damage your opponent can do... Cherrim's Sunny Heal Poké-Power heals your Active Pokémon turn after turn...Life Herb can do wonders to help your Pokémon last longer...and even Turtwig's Leech Seed attack heals Turtwig whenever it does damage to your opponent's Pokémon! Can you stand strong against all attackers?