And they also just announced the Cap Pikachu event. Once again serial code but it's on the website! However, there's a catch: we can only choose one. In addition you need to wait for the one you want as they'll change every week. Like the Japanese version they'll have the moveset reflecting the one Pikachu had that generation:
September 19–25: Original Cap Pikachu: Thunderbolt, Quick Attack, Thunder, Agility
Sept 26 – Oct 2: Hoenn Cap Pikachu: Thunderbolt, Quick Attack, Thunder, Iron Tail
October 3–9: Sinnoh Cap Pikachu: Thunderbolt, Quick Attack, Iron Tail, Volt Tackle
October 10–16: Unova Cap Pikachu: Thunderbolt, Quick Attack, Iron Tail, Volt Tackle
October 17–23: Kalos Cap Pikachu: Thunderbolt, Quick Attack, Iron Tail, Electro Ball
October 24–30: Alola Cap Pikachu: Thunderbolt, Quick Attack, Iron Tail, Electro Ball
They come in a normal Poke Ball, have a Wishing Ribbon, all have a Hardy Nature (neutral), their levels match the season their cap originates from, and it's assumed they all come with Pikashunium Z.
However, if you go to one of the special viewings of the movie they'll have a QR Code that'll get the Original Cap Pikachu (so you might be able to get 2, though good luck finding one of these places).
This kind of stinks, though at the same time I can sort of understand why. In Japan you had to pretty much see the movie 6 times to get all six Pikachu while we're getting it for free, so to be fair we're being limited to just one. Would like if they found another way to give international players a chance to get the others, like maybe when you sell the DVD/Blu Ray have each come with a code you can use to redeem one more.
Anyway, I'm going to get Sinnoh Cap Pikachu. I felt that was when Ash was at his best, and I also liked Paul as a rival who was on equal footing with Ash. BTW, aside from transferring, this is the only way to get a Pikachu with Iron Tail (though USUM may change that, who knows) so if you're thinking about getting the Original Cap Pikachu it doesn't have it. Honestly not that big of a deal but something to note (though since these are special Pikachu would be nice if they made them able to learn the moves of the others via Move Reminder). Also if you didn't get one with Volt Tackle remember there's a Volt Tackle tutor in Konikoni City.