I don't believe any are uncreative. The designs and even abilities/moves etc are actually based on quite creative ideas.
Best example from this thread is Klefki. Pagans believed that fairies stole small items like keys and that the fae were mischievous. Born from that comes Klefki, a steel/fairy type set of keys with the most mischievous ability, prankster.
Voltorb and Electrode, who appear around man-made power plants, appear to be the pokemon version of living bombs.
Diglett and Dugtrio - clearly they are moles. Moles pop up their heads up above the ground and rarely seen above the ground hence only seeing Diglett and Dugtrio heads.
Trubbish and Garbodor are the embodiment of land waste. It was never going to be pretty. Just like Koffing and Weezing are the embodiment of air pollution.
A lot of Pokemon are just based off of animals with some quirks to them either in colouring or additional things (like Floatzel's buoy looking thing around its neck, or Seaking's horn)
I have no issue in any design, really.