Judging by its attractive female-like design and its Pokédex entry, Wifemin is most likely based on "waifus". It may also be based on the Japanese concept of the ideal wife, the "yamato nadeshiko". Its Psychic type is probably a nod to Gardevoir, another feminine-looking Pokémon with a devoted nature, which often appears in sensual Pokémon fanart.
Interestingly, Wifemin has a higher chance of being male than female. This is probably an intentional reference to various feminine-looking Pokémon that have an equal or higher chance of being actually male, such as Gardevoir (50% chance of being male) or Primarina (87.5% chance of being male, like all starters).