The first Valentine's Ponies first came out in 2005 and were Target exclusives in the US.
 

Always & Forever		Yours Truly
Easter Ponies The single ponies were 2005 Target exclusives in the US. Also in Canada at Superstore. The Easter Egg Ponies were available in early 2005 for the Easter Season. They came specially packaged in plastic Easter eggs. (Seen at Fred Meyer, Meijer, and Fleet Farm).
Skedoodle	Lolligiggle		Yesterdaisy
Butterscotch	Pinkie Pie III
Winter Series III Winter Series III - 2005 Target exclusives in the US. Also confirmed for parts of Europe.
Minty	Toboggan		Sno-Glo