Where can I find a light ball for Pikachu?

I would like to use a Pikachu on my team, but without a light ball it doesn't compare very well to a Raichu. Is there anyway to get one in Pokemon X and Y?

Solution 1:

Catch a caterpie and evolve it to butterfree, once you have compound eyes it should be relatively easier to find a lightball since your chances increase 50% I suggest catching the pickachu since I'm not sure if fainting it with thief will get you it's item

Solution 2:

In Santalune Forest, you can find wild Pikachu. In B/W, it is a 1% chance to catch one carrying a Light Ball, but in B/W2, it is 5%. So in X/Y, it is probably 5% as well. If the lead of the party has the ability compound eyes, it increases the chance for the Pikachu to be holding the light ball.

Solution 3:

According to Serebii.net Pikachu has a 5% chance to hold a light ball (the same as Black 2/White 2).

Solution 4:

I decided to do some testing out in the field with a Vivillion (Compound Eyes) and Shuppet (Frisk, Thief):

Route 3: Encounter rate too low for workable results

Santalune Forest: 1 Light Ball / 10 Pikachu

Friend Safari: 3 Light Balls / 20 Pikachu

Accounting for slight variations, we can assume a 10% chance that a Pikachu holds a Light Ball, although this is accounting for Compound Eyes.