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Pichu, Cleffa, Igglybuff, Azurill and Chingling were wasted designs. Make preevolutions for stuff that actually looks like an evolved form, not for things with stats comparable with the unevolved starters.
Munchlax and Happiny are the most reasonable babies. Budew, Wynaut, Elekid, Magby, Smoochum, Mime Jr. and Bonsly are quite neat as well.