Happiny: 1.5 (I understand it exists so that giant Chanseys aren't born out of eggs, but it still sucks)
Chansey: 8.5 - Always liked it in the anime, served its purpose well.
Blissey: 2.5 - The term SkarmBliss is all I will say. Bonus point for Jessie's Blissey friend in the anime.
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Viviff on the go! (or from the toilet)
http://images4.wikia.nocookie.net/board8/images/8/8b/ViviffChampS1.jpg