What would be a huge blow to them lazy party poopers on the gts and at the same time a blessing to the people who are fans of honest gaming: gts pkmn profiles ( include nature and ability ) & trader rating system ( maybe like a 5 star, two color code system, if he has been upvoted enough he will have 5 gold stars, to prevent hacking: if he has had any down votes it will reflect on the amount of gold stars 1 stars: poor quality, yet reliable sometimes 5 gold stars: always reliable. On the opposite end of things if someone continues to lie about IV's or pokerus and gets down voted past the one gold star he will continue to work backwards from one red star to 5 red stars if the trader received his 5th red star for negative activity he will receive an infraction and be banned from the gts for a short amount of time: and any trader that has been banned will have a symbol marking there avatar that they have been. Also yo prevent ppl from just down voting others out of spite at random because they were down voted: you can only vote on people you have traded with and only vote for up to 1 hour after the trade was done.
A man can dream
As much as I see the intention behind your suggestion, that'll never work, unfortunately. There's always bound to be some **** who "down-votes" you just for the sake of it.
Maybe they could improve more filter options to prevent asking for underleveled trades (e.g. Electrode level 1-10).