Gengar

If rumors are to be believed, then it can be said that the Gengar was born from the shadow of Clefable. This spherical, purple-colored Pokemon is supposed to have come to life with the sole purpose of causing mischief. And if you look at the picture of Gengar here, you can easily realize how mischievous this Pokemon can be indeed mischief of the troublesome kind is dancing in his eyes and on his naughty smile. However, remember that all this is just a rumor. Regardless of that, note than Gengar is a strong fighter and boasts of having a huge move pool.