To see a tidal wave in your dream represents an overwhelming emotional issue that demands your attention. You may have been keeping your feelings and negative emotions bottled up inside for too long. On a positive note, the tidal wave symbolises the clearing away of old habits. If you are carried away by the tidal wave, then it means that you are ready to make a brand new start in a new place.
To dream that you can create a tidal wave with your mind is analogous to your ability to control your emotions and keep them in line.