lightball doubles both the Special Attack and Attack stats when held so is better as timid/jolly
it all depends on you prefer,
-Volt tackle
-Nuzzle / Quick attack
-Reversal / Brick Break / Iron Tail
-Knock off
are good moves for physicall pikachu, Im no saying physical pikachu is better... both are good bcs SpAttaker Pikachu can learn moves like signal beam, Hidden Power and Grass Knot.
as i said all depends on what one likes.