Vista Point Secret
After you defeat Andromeda, go back to Vista Point and turn into megaman. Then go to the plane where the red navi walks into, turn left and there should be a wavehole there. Walk into it and you will be transported to outer space. There will be doors opened only if you follow their requirements.
The Fourth Brother
When you beat Andromeda go to vista point and
talk to the geek guy. He will say there is a
squeak in the piano. Then go to the Gym and talk
to the piano. Then a wave hole will open. Then go
to the wave hole in the piano. There will be
these tall dudes. Talk to the first one. You will
fight a bunch of viruses that are really hard but
it is worth beating. OH yeah after you beat them
talk to the geek again and you will register him
as your brother.