Legendaries? WOT R U? CASUL?
Mewtwo - Overrated, didn´t deserve two megas. I would´ve been fine with the Y-Form, because it´s more similair to Mew. It also looks better.
Mega-Rayquaza - Because it got banned from being banned. Making it this OP was unnecessary.
Arceus - Too weak for a god. That´s one Pokémon that is supposed to be overpowered until it gets banned to the point that nobody can use it, but isn´t.
Regigas - I love it, but there is only one thing stopping me from really loving it: It´s stupid ability.
The Lake Trio - Hate all three equally. They look terrible AND are the same. Yeah, BW2 gives them different animations, but it still feels lazy as hell. And f<3ck Landorus. Every time I got a physical attacker who has a nice battle and has fun killing stuff and I see that thing I wanna punch someone. And that thing being common doesn´t help it.
Zygarde - Third in the trio (or a single thing excluded from the duo?), still way weaker than Xerneas and overall just meh. Same typing as Garchomp, which is overall better and cooler. Should´ve represented undeath or something, something that is between life and death. Yeah, "Order" is pretty cool as well, but why represent "Order" and "Ecosystem" when you can make some kind of a zombie-dragon-legendary?
Design is lackluster as well :/
Phione - Each time I see it, I think "Why? Just WHY?"
Magikarp - Obvious reasons.
EDIT: I already dislike Volcanion already. Hate its weirdass donut-design and the fact that the awesome typing of Fire/Water gets introduced with this abomination :/ I know they´re supposed to be cannons or some shit like that, but when those back-antlers are closed, they look like a frigging donut.