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Cobalion, Terrakion, and Virizion should get more attention, and Suicune, but definetly Dedenne. It is cute, and is better than most of the XY desings.
A Pokemon I've noticed not get much love the last few years is Drapion. Its got solid to above average stats, nice ability and can perform multiple functions in battle. Not to mention its design is actually quite cool, one of the actually intimidating designs in Pokemon.
Zebstrika, it's an awesome design and it's easily one of the most powerful electric types
Also Skitty/Delcatty with it's variety of powerful moves of different types, although it's unfortunately kinda weak stat wise
Haxorus. Overshadowed by faster Dragons, this Pok?mon is often left off of competitive battling teams, but with a massive Attack stat and Mold Breaker, I think it's extremely underused. :)