Not sure about it.
I have got a 20%IV-2800 CP dragonite, who really is a bad prestiger. Gives only 100 XP when prestiging.
On the other hands side, i have got a 98%IV-150 CP abra, who is a really bad prestiger. It does not defeat the defenders, gives 0 XP when trying to prestige.
I tend to believe, that IV is not all what is neccesairy to make a good prestiger.
Abra has a slightly lower base DEF, that is probably a reason.
Abra has low def, low sta and very high att. This makes him a glass cannon, makes his battling performance overrated with cp and makes him a bad prestiger par excellence. Same applies to kadabra and simsala.
My original post was just kidding. I could not resist to do so, as these points were discussed over and over again last weeks.
What makes a good prestiger:
(1) Correct CP. CP should be about 50% (to 70%) of the pokemon you want to prestige against. 50% and lower makes fighting unneccesairily hard, more than 100% gives much less xp (<250).
The range obviousely depends on the gym you are training, but as a rule of the thump, 1100...1500 CP are considered ideal.
(2) Good typing, same thinking as with normal attackers - optimal is super effective into defender, not very effective in return
(3) Good, powerful, moveset, STAB prefered, fast quick attacks for dodging, strong charged moves. 1-Bar-Charged moves are difficult, as they leave your attacker long time unable to dodge and unprotected.
(4) High Def- and STA-Stats. All Stats (ATT / DEF / STA) have same impact on combat performance, but DEF and STA are taken square-rooted into CP, ATT directly. So with DEF and STA you can get high combat performance at low CP.
How to take IVs into account? They have a direct influence on ATT / DEF / STA (See 4th Point) and raise combat performance and CP (see 1st Point).
Conclusion:
TL&DR + General Speaking: For prestiging, high IVs are not neccesairy, sometimes they are not even good.
Actually the opposite.
A lower IV will need to be a higher level to be of the same CP.
It may cost more candy/dust to achieve the required CP with a lower IV, but it will mean you have a higher level mon.
It will result in fraction of a % difference in the fight.
Low IV is fine for a prestige...just get good moveset and CP
CP is king for prestige - evolve the one that will give you the exact CP range you are looking for, so you don't use dust and candy...and then hope for moveset. Nothing else matters.
Since I can't obviously evolve every pokemon I catch, I need to make some sort of choice to narrow the options. For training pokemon, I think more important than the total percentage is the actual IV distribution. I look for IVs that balance out a pokemon's weaker base stats. Examples:
https://pokemongo.gamepress.gg/pokemon/2
Ivysaur has equal base Atk and Def, but lower Stm, so I look for Bulbasaurs that have at least a high Stm IV to evolve to try for Vine Whip/Solar Beam. I don't want one with high Atk IV and low Stm IV.
https://pokemongo.gamepress.gg/pokemon/40
Wigglytuff has skyhigh Stm, so I don't care as much about Jigglypuff's Stm IV. Its Def IV is more important, then Atk.
For the most part, a lot of pokemon have lower base Stm than their other base stats. So until you learn the exceptions, a good general rule of thumb is to look for pokemon that at least have a good Stm IV.
If you bother to worry at all about IVs for training pokemon.
