Yep, Pikachu's a boy. We can at least tell now because females have a cleft tail instead of the regular box shaped tail. Speaking of, I wonder in the next game if Pikachu will get alts with the female tail or even ORAS's dressup costumes. Likely not, I think he takes much more inspiration from the anime than people give him credit for, i.e Ash's Pikachu, who's male.
Regardless, Pikachu's placement on the tier list so far has me really excited. Also, Charizard is my main...so you can see why. Charizard isn't A tier by any means but placing him next to Mii Swordfighter is complete bulls**t. I still think he's one of the better heavies. In any case, Charizard and Pikachu are my main characters I always play, mostly because Pikachu was my main in 64, Melee, and Brawl. (Trivia, Pikachu was considered S Tier in N64. Yep, that game has an official tier list)
But now that Charizard is free from the Trainer's clutches (at the sad expense of Ivysaur and Squirtle), I use him as my main pick with Pikachu on speed dial whenever I gotta go fast. If I'm going up against Diddy or Shiek I pike Pika, if I go up against Bowser or Rosalina I pick the Zard. It's good to have options. I'd normally try to work Bowser and Dedede in there, but their poor matchups are also Zard's poor matchups.