Well, they make great emotional support pokémon, specifically. The reason why is because togetic are very much like blissey: dedicated to the happiness of their human partners. As such, togetic will do everything they can to lift the spirits of anyone they sense is unhappy, often by providing “joy dust,” or puffs of its own down. For a reason that researchers have yet to fully explain, this joy dust is widely considered to be an extremely comforting substance to touch. In a way, touching joy down is much like looking at pictures of baby animals or pokémon: most people, regardless of background or preferences besides that, find happiness and comfort in doing so.
Additionally, togetic can use this ability in combination with their natural moves—particularly Charm, Safeguard, or Yawn—to help their partners focus on them and allow them to feel safe, protected, or calm. This, in addition to this pokémon’s naturally attentive nature, allow togetic to function as some of the most effective non-psychic support pokémon out there.
Of course, a togetic’s effectiveness only increases when it evolves into the down-covered, extremely loyal togekiss, but that’s more or less a side point.