Depending on what you consider a movie the answer is either 2, 4 or 15
There have been 2 theatrical release movies, one in 1986 and another in 2013. There were also 2 made for TV movie specials from 1984 and 1986. Additionally there are 11 straight to video "movie" releases; one from 1986 and the rest released between 2003 and 2009.
Side note: There have also been 3 TV series, a couple of short films, Video Games and a documentary. Listed below are all that I could find information on. Further research can be done through sites like IMDB (see related links section)
Movies:
My Little Pony (1984) (TV movie/special)
My Little Pony: Escape from Catrina (1985) (TV movie/special)
My Little Pony: The Movie (1986) (Theater release)
My Little Pony: Equestria Girls (2013) (Theater release)
Straight to video movie releases:
My Little Pony: The End of Flutter Valley (1986)***
My Little Pony: A Charming Birthday (2003)
My Little Pony: Dancing in the Clouds (2004)
My Little Pony: A Very Minty Christmas (2005)
My Little Pony: Friends are Never Far Away (2005)
My Little Pony: The Princess Promenade (2006)
My Little Pony: The Runaway Rainbow (2006)
My Little Pony: A Very Pony Place (2006)
My Little Pony: Greetings from Unicornia (2006)
My Little Pony Live! The World's Biggest Tea Party (2008)
My Little Pony: Twinkle Wish Adventure (2009)
TV Series:
My Little Pony 'n Friends (1986-1987) (61 episodes)
My Little Pony Tales (1992) (22 episodes)
My Little Pony: Friendship is Magic (2010 - still in production) (65+ episodes)
Shorts:
Once Upon a My Little Pony Time: So Many Ways to Play (2009)
My Little Pony: Reign of Buttercup Sprinkles (2009)
Documentary:
Bronies (2012)
Video Games:
My Little Pony Crystal Princess: The Runaway Rainbow (2006)
My Little Pony: Pinkie Pie's Party (2008)
***The End of Flutter Valley is a full length film straight to video and is actually considered the sequel to the original "My Little Pony: The Movie" theatrical release and is also the pilot to the first television series "My Little Pony n Friends" and bridges the gap between the two.
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Megan took care of the little ponies. She had a brother (Danny, I think) and a sister Molly.
The original line of My Little Pony began with the Earth Ponies in 1982. The Earth Ponies were later followed by Pegasus Ponies, Unicorn Ponies, Flutter Ponies and Sea Ponies. Flutter Ponies were smaller and thinner than Pegasus Ponies, and had fluttering wings. Windy Wing and the Summer Wing Ponies were smaller than the Flutter Ponies and were proportioned in a similar way, with larger, butterfly-like wings. The Sea Ponies resembled seahorses, and were produced as both adults and babies. There were also male ponies called 'Big Brother Ponies', which had slightly larger bodies and feathered hooves resembling those of Clydesdale horses.
My Little Ponies came out first as a toy, and short animated features used as promotions also came before My Little Pony Tales.
My Little Pony started in 1983 by an American designer, Bonnie Zacherle. In 1981 they had submitted a design patent in August, which was granted in 1983, and she began working for Hasbro. The first ponies were Rainbow Ponies, other variations were So-Soft Ponies, Twinkle-Eyed Ponies, Twice-As-Fancy Ponies, Brush-N-Grow Ponies, Pony Friends, and Baby Ponies. An animated My Little Pony series started in 1986 and ran to 1987. The first generation of My Little Ponies were sold in the USA for 10 years but went until 1995. The final year was called the "celebration year" of My Little Pony. If you're wondering about the current My Little Pony, that centers around Twilight Sparkle, that was developed for television by Lauren Faust who also helped work on the Powerpuff Girls and Foster's Home For Imaginary Friends.
There is no official answer, but many fans have drawn it. There are plenty of examples - you can look them up.