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Chesnaught (this guy gets so much hate for no reason), Klinklang (especially the flavour it's signature moves add), Vanilluxe (it's silly and fun), Samurott (well not everyone, but it's divisive), Staraptor (badass), Garbodor (redeemed during a Nuzlocke, but pretty amusing designwise).
Honestly I don't really dislike many Pokemon, a lot of things give me a negative vibe early on such as Slurpuff and Aromatisse but I don't really have anything against them anymore as I learn to accept after the initial knee jerk reaction.