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My main bro (Skarmory) is already and has been OU for quite some time. Dugtrio is another one of my favorites (mostly because it was a star player in my Yellow version as a kid) and that was OU for a little bit before they banned Arena Trap. Piplup will never, ever be OU and nothing I do to it can make that happen. So we're going with my next favorite after that, Raichu.
Now, Raichu has potential as a powerful threat, given its movepool, but it totally lacks offensive presence. I'd say simply let Light Ball work not just on Pikachu, but on Pichu and Raichu too. Should give it enough power to compete with Tapu Koko, Zeroara, Xurkitree, Thundurus, and Mega Manectric (the main speedy electrics) now, right? That should at least take it to BL, right?