Ah, yes. I believe I know exactly which pokémon you mean!

Bouffalant
The Bash Buffalo Pokémon
Type: Normal
Official Registration #: 626
Entry: A five-foot-tall buffalo pokémon known best for its luxurious mane of hair. The hair itself forms a perfect halo of soft curls that are capable of absorbing damage from almost any attack. Likewise, just as the beard of certain martial artists conceal a third fist with which they may deliver devastating punches, the hair of the bouffalant conceal a rock-hard, horn-like skull plate that adds an incredible amount of power to the species’ already deadly Head Charge attack. Indeed, the glistening, chestnut curls of this creature form the most beautiful hairstyle of any pokémon in existence. It is the hair that puts furfrou’s tamable fur coat to shame and makes milotic’s rainbow-colored scales look utterly dull by comparison. It is the mane of power, and no mere mortal is worthy to gaze upon its magnificence.