I keep 0% IVs (37), Level 1 (232), and 100% IVs (281). Other than that they wait until the next Evolve Session and then get put into the blender.
how 
You arent saying you have 281 100 IVs I’m seeing something…
I power up 96iv or better for legendaries. Meta pokemon 96iv. For defenders 93iv or better
Depends on the situation tbh, my best Metagross was 13-15-14 so I went with that
I power up the 6 best IV of the best meta relevant pokemon of each type.
When it comes to what I keep, I keep anything 93% and up, however if it is shiny or legendary, then I keep all shinies, 12 best of each legendary and for all others, I will keep the best even if it is not 93%+.
Depends on the type and how bad I need them and how good they are. For CD I evolved a 89% Metagross but in any other case I prefer 91% or higher. For certain gen 1 and gen 2 pokemon that are meta relevant, I prefer 96% or higher. I also don’t power-up anything that doesn’t have 15 attack
Depending on circumstances 93 (at least A14) is the lowest Im comfortable with, exceptions are for CD pokemon (also depends how good they will be in practice), I have Ttars and metagross below 80 but they all have A14/15 and a decent level. At the same time I keep my weather boosted army but just never use my resources on them. That being said if I power up something it usually will be 96-100.
90
I’m a stardust snob. With the exception of Legendaries, I won’t use dust on anything below 95%. lol
I will keep anything over 60
But for special mons I keep them no matter the iv
To level up? 93% with perfect Attack. Nothing less. I can do 98% with perfect HP and Defense though.
Attack that is only 13 is a complete deal breaker. I had to pass over a Raikou and an Electivire for Kyogre Counters for now because of that.
96% IV or higher on all Pokémon non PvP (With an exception of maybe 4-5 with IV 87-93 with 15 attack)
15 Attack min requirement for keeping anything.
Legendary Poke: IVs can be High 80s as long as Attack is 15 always but trash anything with less than 15 (With 2-4 exceptions)
PvP: IVs don’t matter
Use to keep anything 91% or higher, but now keep anything with attack stat of 14 or higher, planning to progress to perfect attack only, then gradually increase the defense stat, then the HP stat.
I don’t normally check IVs, so it doesn’t mean much to me. You like it, you keep it. If not, transfer it.
I usually keep most “simply amazes me” but once in a while I might keep a pokemon with below 80% IV’s, but only with high cp, a couple of examples are my two 70%+ ish vaporeons, and a nidoran with high cp, with 70%+ ivs.
For Common with a high average: 84-86%
For less common (with a low average): 82%
For rares: 70%
For legendary caught between 1-3: 0%
For legendary I have more than 3: 80%
For Shiny’s: 0%
Some commons have generaly a low IV, below 70%. If I have a 84%+ then I transfer them instantly.
Changed my opinion a lot on this. For me, it depends on how hard is to find said Pokemon. I evolve and use TMs on anything that’s 70%, 12+ ATK and level 28 or above.
When it comes to powering up:
Legendaries: 91%+ with at least 14 ATK, nothing less. Only exception I’ve made is Groudon because I haven’t caught a 91%+ yet! And I have about 45 caught.
“10K hatches”: 80% with 13 ATK and you’re good to go.
Other things like pokemons to unique 6 challanges (my favorite solo raid), I try not to be too picky and just evolve using my first criteria.