Think one is Thunderbolt but I am not sure. :S
ThunderShock Thunderbolt "Leer"-improvised move, probably not actual leer. Agility Quick Attack Thunder Double-Edge Tackle (can't be legitimately learned by pikachu in the game) Iron Tail Volt Tackle
There are also the improvised moves pikachu used, but they aren't actual attacks.
http://bulbapedia.bulbagarden.net/wiki/Ash's_Pikachu
That's from the anime, if you mean the new event pikachu, then:
ThunderBolt Iron Tail Quick Attack Volt Tackle
Okay, ill give you CURRENTLY known moves that Pikachu knows
There is a Ash's Pikachu event coming soon, so I think you should get it
http://serebii.net/games/currentevents.shtml
If you saw in the end of season 1, pikachu has quick attack, electro ball, thunderbolt, and iron tail.(pikachu forgot VOLT TACKLE for electro ball)
Pikachu knows : electro ball/quick attack, volt tackle, iron tail, and thunderbolt (I'm guessing ash made his pikachu forget quick attack for electro ball)
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Ash's Picachu Ash's Picachu Kinda Alternates moves in Different Shows But It's Moves That Were Used So Far Is: ThunderShock,Thunderbolt,Leer,Agility ,Quick Attack ,Thunder Double-Edge,Tackle,Iron Tail ,Volt Tackle
So Far In BW it Knows, Quick Attack Thunder Bolt Electro Ball Iron Tail
Hope I Helped :) [1]: http://cdn.bulbagarden.net/media/upload/c/c3/Project_Anime_logo.png