You must be confused. He was in Pokemon the 3rd Movie. Suicune was in Pokemon 2000. Sorry.
Suicune because of its complex design and moveset. However there is a place in my heart for Entei.
Lugia was in Pokemon 2000. Suicune was in the 4th movie with Celebi. -_-;
My favorite would be Suicune, I guess...