Every year the flu virus evolves into a new form that is not affected by the previous year’s vaccine. If that is not evolution then we are wasting our time and our money on these vaccines. I doubt if they have changed due to the wave of a magic wand. I guess the experiment could be stated as: if you take last years vaccine for this year’s flu, you will probably get sick. Or at least the percentage of people using last year’s vaccine and getting sick will be a lot higher than those using this year’s vaccine.
Again, you are confusing facts with theory. The fact that a flu virus mutates does not prove the theory of evolution. Now, if the flu virus mutates overnight into a butterfly, you would have stronger experimental data for the theory of evolution. But again, experimental data does not prove any theory of any kind or sort. That is simply the nature of inductive reasoning.