Originally Posted by Fat LivingRhino
We're not going to go over all the shoulda, coulda and woulda's. By the time you've tried to set up a nasty plot AND an agility, your Pikachu would most likely be dead or countered by most teams. Pikachu is not viable in the current meta, as there are many alternatives to choose from... using a double set up sweeper Pikachu is just going the extra mile for something that will most likely never, ever happen.
Double Dance doesn't mean trying to get both boosts, it is meant to use that set-up move that you think is useful for that situation.
However double dance seems neat on paper, but I don't think it can work. There's enough priority that even Raichu has trouble setting up, and do note that Raichu fares far better in NU than Pikachu will ever be.
Alas, Pikachu just won't do. Light Ball is an interesting item to have, but since only Pikachu can use it, it's fairly useless in the end: Pikachu is frail, has a 'meh' speed and lacks good breaking-power.