To prevent a black market for perfect pokemon from forming.
Realistically - trading right now is completely fun. You're psyched when you receive something with great IVs because you don't expect it. Mostly I trade for distance candies on tough-to-find pokemon. Others may trade for dex entries. No one is trading for elite fighters though, which is great. Stops the game from becoming pay to win, when the person getting paid isn't even the developer.
When the IV scanners were still operational (March 2018) a certain type of player might gather dozens/100s of perfects. If someone consumed that amount of gas to get them, then they might now try to sell them.
Plus people like to play the lottery, 48% to 100% plus lucky, truly a rags to riches story
Mostly seems to be a good way of keeping alt accounters from sending the best mon to to their main account, ie malicious alt accounters, (something like getting 3 times the mewtwo anyone else has in the area) I know a few people who have alts strictly for ''air support' in raids, or like the others say, creating a black market for the pokemon.
for me right now, tradings just something fun to do, traded a larvitar to a friend for one of his dragon pulse amphy, its iv's went to crap, but I didnt care too much, I like ampharos and wasn't able to get a dragon pulse one back when it had the event. But the way I see it, in terms of practical aplications, isnt really IV related, its a good way to convert bad IV rare pokemon you got on vacation/collage into more candy that you could get otherwise, college students get the best end of it if they travel long distances and have relations with a group at home and at school, thats what me and my groups are planning, stocking up on kirlia and tyranitar, then trading them to one another for 3/4 extra candy from a trade, and some suggested transfer them for an additional candy (I personally wouldn't release a tyranitar, but others may have less qualms with that)
TL;DR. All in all, it seems to be just a fun thing to do with friends, and a small assistance for players who got rare pokemon while traveling, giving soemthing like a ralts you got far a way to someone else helps both, they get a ralts to bussy with and possibly good iv's, and you get 4 extra candy, its a win win
Yes, assuming all of its IVs are at or above the IV floor for your friendship level. If you had a 1/0/0 and traded it to a good friend, it'd become a 1/1/1 or better. Thus, the chance of keeping the same IVs is 0% if the IVs are bad enough.
It's pretty easy to calculate the chance of it remaining the same if you know the IV floors.
Good Friends: if the lowest IV >= 1, it has a (1/15)^3 chance of retaining its IVs.
Great Friends: if the lowest IV >= 2, it has a (1/14)^3 chance of retaining its IVs.
Ultra Friends: if the lowest IV >= 3, it has a (1/13)^3 chance of retaining its IVs.
Best Friends: if the lowest IV >= 5, it has a (1/11)^3 chance of retaining its IVs.
Note that these assume all IVs above the IV floor are equally likely. Lucky Pokemon may have thrown a wrench in my math.
Prevent cheating.
Trading was one of the first features announced to come to PoGo. However, Niantic was forced to hold the release for 2 years until they found out a way to prevent exploits of trading. Spoofers, bots, scanner hunters of perfect meta relevant pokemon, account sellers, multi account players... All these are the reason IV reroll has become indispensable.
It's a smart measure and works just fine. If you intend to trade meta relevant pokemon, you have to work through your friendship bonus first. If you just want to fill your pokedex with regionals, etc nobody cares about IVs.
But nobody can cheat or make real money selling accounts full of perfect pokemon this way.
Well done Niantic!
