>>47821996human features onto a gardevoir. when you say human features what you really mean are the curvy bits, as adding psychic and fairy powers, removing or fusing fingers, removing feet, removing skin pigmentation, enlarging the eyes, etc etc would be much more difficult and life threatening to the subject.. whether it could be done through plastic surgery, genetic editing (extremely advanced), editting a pokemon while its in the computer, presuming thats viable.
unless you find a gardevoir that is already partially human and you just stimulate growth in those areas via hormones or editing. but yes, the target result is much easier to achieve with a gardevoir base as its less work and mostly cosmetic