Go to a furry convention. I'm sure you can find yourself a Unicorn. Find yourself a sadist Unicorn and I'm sure he/she will have no qualms with setting you on fire. weirdos.
Well according to the anime, a Rapidash's fire won't burn those who it trusts.
If you just met your furry Unicorn today, chances are, it hasn't know you long enough to trust you. Besides, the Pokedex didn't say anything about a Unicorn that may simply enjoy watching you squeal in pain. I thought that fire was one of Rapidash's qualities that made him appealing to you guys... Don't you want to be set on fire?