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Gens 1 and 4 were by far the hardest to do in the sense of not being able to think of enough I really like, and gen 5 was also extremely hard in the sense of having too many that I really like to pick from.
Top ten overall, in order, is Meganium, Umbreon, Absol, Lucario, Sigilyph, Ampharos, Lilligant, Flygon, Espeon, and Joltik.