Hitler does not seem to have had strong views on evolution. Anti-evolutionism was certainly not part of Nazi party ideology, in any case. Within the Rassenhygiene movement that often characterized the "scientific" justification for Nazi biological concepts, evolution was widely accepted.

There are those who would benefit in their politics for associating Hitler with Darwinism (often Creationists), and those who benefit from trying to disassociate him (often anti-Creationists), so Googling it can get you pretty paradoxical extremes. The truth of it (as often) seems somewhat in the middle and not very politically "useful" to either side (the Nazis sometimes used evolution as a motivation and sometimes did not). The best overall book on these matters is Robert Proctor, Racial Hygiene: Medicine Under the Nazis (Harvard University Press, 1988).

Where did you see the claim that Hitler didn’t believe in evolution?