The official Japanese Pokémon website has announced that there will be a distribution of four Pokémon as part of the Powerful Tag Pokémon (強力タッグポケモン) campaign at the Pokémon Centers. From May 7th, 2012 until May 31st, 2012, players of the Japanese version of Pokémon Black and White can receive Kyukon (キュウコン) and Chandela (シャンデラ). From June 1st, 2012 until June 22nd, 2012 players can also receive Lucario (ルカリオ) and Elphoon (エルフーン). Below are the full details for each Pokémon.

Kyukon (キュウコン)

Pokémon	Info
	Level: 50
	OT: PC
	Poké ball: Cherish Ball
	Ribbon: Classic Ribbon
	Ability: Drought
	Held Item: Chesto Berry
	Attack 1: Heat Wave
	Attack 2: SolarBeam
	Attack 3: Psyshock
	Attack 4: Will-o-wisp

Chandela (シャンデラ)

Pokémon	Info
	Level: 50
	OT: PC
	Poké ball: Cherish Ball
	Ribbon: Classic Ribbon
	Ability: Flash Fire
	Held Item: Pecha Berry
	Attack 1: Heat Wave
	Attack 2: Shadow Ball
	Attack 3: Energy Ball
	Attack 4: Psychic

Lucario (ルカリオ)

Pokémon	Info
	Level: 50
	OT: PC
	Poké ball: Cherish Ball
	Ribbon: Classic Ribbon
	Ability: Justified
	Held Item: Persim Berry
	Attack 1: Bullet Punch
	Attack 2: Close Combat
	Attack 3: Stone Edge
	Attack 4: Shadow Claw

Elphoon (エルフーン)

Pokémon	Info
	Level: 50
	OT: PC
	Poké ball: Cherish Ball
	Ribbon: Classic Ribbon
	Ability: Prankster
	Held Item: Cheri Berry
	Attack 1: Swagger
	Attack 2: Giga Drain
	Attack 3: Beat Up
	Attack 4: Helping Hand

Sources: http://www.4gamer.net/games/104/G010490/20120427038/ and http://www.pokemon.co.jp/info/2012/04/120427_p01.html