On top of all the changes over the years even Pikachu's stats have changed. In the latest generation Pikachu's defense and special defense have risen by ten. Pikachu learns lots of moves including one of the best electric move thunder, at level 50.
  There is also an item in the game made just for Pikachu called a light ball. if a Pikachu is bred while holding this item the offspring will know the move volt tackle witch is the most powerful move a Pikachu can learn.

Want to learn more go to Bulbapedia to find it.


Stat           Gen.I-V        Gen.VI
HP:                35               35
Attack:           55               55
Defense:       30               40
Sp.Atk:          50               50
Sp.Def:          40               50
Speed:          90               90