This was everyone's reaction:

 

He's still not MewTwo. 

He's still not MewTwo. 

But...Greninja man. Greninja!!

Too many Pokemon. If you're gonna give a shit load of Pokemon at least give the fans the one they wanted, (MewTwo) instead of just crowding the game with more and more.

more like

But Mewtwo sucks I like that they chose Greninja and Charizard

I was hoping for Delphox, truth be told.

Too many Pokemon. If you're gonna give a shit load of Pokemon at least give the fans the one they wanted, (MewTwo) instead of just crowding the game with more and more.

You do realize Brawl had six total Pokemon reps, right?

You do realize Brawl had six total Pokemon reps, right?

 

Doesn't change that it's too much.

I was to busy going crazy about Mega Man's final smash to care about the reveal of Greninja. 

I don't give a **** about Mewtwo, he's too overrated for me to like him that much. I prefer Greninja, at least he is NEW.

 

My reaction with Pokemon in SSB4 was like... Pikachu? Well he's the mascot... Lucario? But he was in SSBB... Charizard? Oh great, the second mascot comes in again, and this time alone... Will I EVER get to see the new Pokemon shine? Wait... there's one more in the trailer. Mewtwo? Oh please no....... wait a second that's not Mewtwo, that's...! YES GRENINJA YES, I LOVE YOU FINALLY A NEW POKEMON IN THE GAME

Doesn't change that it's too much.

I personally see no problem with it, considering Pokémon is Nintendo's second most lucrative franchise. 

As much as I was hoping to see Mewtwo in, I honestly like Greninja even better. With Lucario (CoughTheMewtwoCloneCough) in the game, Mewtwo wouldn't feel as unique. Greninja works a lot better in my opinion.

There is still a little chance of Mewtwo being in Smash, but truth be told, I am more of a fan of Lucario than Mewtwo. I like them both a lot, but Lucario is like my sprite Pokémon. I can use him better than I can Mewtwo, but I still use Mewtwo a lot on Pokémon X. But I also love Greninja, how can you not like a ninja frog with a freakiest tongue?

And about Mega Man, I love how they have a way to use his multiple forms. I love X and the one from the anime!