If we’re talking about those with hypersensitivity issues, yes, indeed!
I touched upon how pokémon with psychic abilities may assist those with sensory issues in an earlier post (http://bills-pokedex.tumblr.com/post/162059972964/are-there-any-service-pokemon-youd-recommend-for), but to put it in short, the reason why psychic-types may be popular for this kind of work is because they’re capable of either teleporting their partners to a safe location, assisting with communication if their partners become overwhelmed, projecting calming auras or leading their partners in on-the-spot grounding exercises (as an immediate coping mechanism), and/or by either detecting or predicting oncoming situations that their partners may have difficulty navigating due to their sensory issues.
That having been said, though, while gardevoir isn’t necessarily the most popular choice for this work, it is fairly popular for hypersensitive people due to the empathic abilities of its evolutionary family. With these abilities, gardevoir (as well as ralts and kirlia) are capable of detecting the subtle shifts in their partner’s emotions, and thus, they can tell when their charges are overwhelmed, sometimes even before their charges themselves realize it.
For hyposensitive people, however, gardevoir’s empathic abilities are less effective because hyposensitivity is marked by a lack of reaction to a stimulus (and you can’t quite detect an emotional reaction that doesn’t exist), so you would be far better off with a pokémon that either has quick reflexes (such as medicham) or precognitive abilities (such as gothitelle). The reason here being that it becomes much more important to assist a hyposensitive person with literally navigating the world, rather than coping with overstimulation, and these pokémon can either predict obstacles or react rapidly to them to keep their partners out of immediate harm.
The Pokédex According to Bill 