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Braviary, the noble eagle, classic German symbolism
Registeel, the closest thing pokemon has to an iron cross. Bonus: one of his early sprites looks like it's heiling!
Groudon, father of all land (He called Germany "Der Faderland")
Smeargle, since he really wanted to be a painter before he became a dictator
Reshiram, since he represents idealism and is pure white
Weezing, for poison gas. Hitler was a veteran of WWI, and saw poison gas as one of the strongest and most efficient weapons known to man, which was one of the reasons he used it so extensively on the jews, the gypsies, the homo, whoever wouldn't heil him, etc.
How did I do?