I'm a big Smash Bros fan, have been since I discovered the game a few years ago, but the hype for Pokemon remakes has been around ever since heart gold and soul silver and it only skyrocketed since the announcement of the games, so definitely Pokemon will win. :/
X & Y sold about 12 million copies worldwide in around 6 months...
While I'm skeptical about ORAS reaching XY's target, I'm positive that it'll sell more than SSBB.