First, let's define "pseudoscience". According to Wikipedia:
Pseudoscience consists of statements, beliefs, or practices that are claimed to be scientific and factual, in the absence of evidence gathered and constrained by appropriate scientific methods.
Pseudoscience is often characterized by the following: contradictory, exaggerated or unfalsifiable claims; reliance on confirmation bias rather than rigorous attempts at refutation; lack of openness to evaluation by other experts; and absence of systematic practices when developing theories.
The term pseudoscience is often considered pejorative because it suggests something is being presented as science inaccurately or even deceptively. Those >described as practicing or advocating pseudoscience often dispute the characterization.
With that in mind, hypnosis is most certainly NOT pseudoscience. There is plenty of scientific, non-anecdotal evidence, that points to the legitimacy of hypnosis. We link to some articles of that nature in the Resources section of this site, but there are many, many more articles to be found.
Wikipedia maintains a List of topics characterized as pseudoscience. Note that hypnosis is conspicuously not on that list, though there are are a few of the more rediculous claimed uses of hypnosis that made the list. Those aren't things you will find at Hypnotechs.