Jigglypuff is a pokemon from the original 150 set. I never used her that much in the games, but I liked her other appearances.
Such as her cameo in the pokemon anime as a wannabe singer that puts (literally) everyone to sleep. Then gets mad. Classic comedy.
She was also a decent fighter in the Super Smash Bros. series. Dangerous with more skillful players. The sing ability needs to be a tad stronger though.
Her original Japanese name is プリン (Purin) which is the Japanese word for pudding.