[Harsha]

I can write and advise for Keldeo, Ninetales, Politoed, and Volcarona. I'll edit my post here with them when I write them.

Keldeo:

<p>Keldeo may arguably be the cutest Pokemon in the OU tier, but that's not all there is to this pretty pony! With a great base 129 Special Attack and a good base 108 Speed, it has all the tools it needs to punch holes in opposing teams with relative ease. With Secret Sword, it becomes one of the only special attackers in the entire metagame that is capable of getting past Chansey and Blissey with ease. With all of these pros, it's hard to imagine that there are reasons to not use Keldeo, but sadly, this is the case. While Keldeo has great STAB coverage, especially with access to powerful moves such as Hydro Pump and Secret Sword, it has a very shallow movepool. In fact, what walls Keldeo is usually determined solely by the moves it runs. Keldeo is usually limited to running its STABs and a Hidden Power of choice for coverage, but this pony certainly isn't one-sided. With a great boosting option in Calm Mind, the ability to run power-boosting items such as Life Orb or Choice Specs, and the ability to speed up with Choice Scarf, Keldeo can definitely wreak havoc on opposing teams.</p>