From Wikipedia:
Dragon Quest Monsters: Joker 2 (ドラゴンクエストモンスターズ ジョーカー2 Doragon Kuesuto Monsutāzu Jōkā Tsu?)' is a Nintendo DS role-playing video game published by Square Enix. It is the sequel to Dragon Quest Monsters: Joker and is the fifth game in the Dragon Quest Monsters series. It was released in Japan on April 28, 2010 and a US release on September 19, 2011 with the European release following on October 7, 2011.[3] An expanded version of the game, titled Dragon Quest Monsters: Joker 2 Professional, was released on March 31, 2011. It features new monsters and abilities, with the same story.
Joker 2's gameplay follows closely to its predecessor. Players explore islands and tame wild monsters into their party. Monsters fight in turn-based combat and grow stronger. Hundreds of monsters from the Dragon Quest games appear in Joker 2, with a few new species. This is the second game in the series to feature Wi-Fi support.