How are people finding High IV Pokemon?

Your best luck is with egg hatching. There were also scanners that would tell you the IV's and individual stats of each pokemon wherever you scanned.

Most of the 100% mons would be hatched - all 4 of mine are.
It is just luck of the draw.

The odds of catching a 100% IV pokemon in the wild are about 1 in 4,100. The odds of hatching one from an egg are 1 in 216. I've caught over 15,000 wild pokemon, and three had perfect IV's, that I know of (it's possible I may have transferred some without checking IV's). I've hatched 585 eggs, and four of those were 100%.

It's simply a matter of randomness and statistical probablility.

Realistically, having 9 incubators work simultaneously and have "hatching sprees" will give you the best chance of consistently getting high IV Pokemon.

In short, spending real cash would REALLY help. The game is designed to be like this.

Chances are very slim. I have caught 8000 Pokemon and to my knowledge only one Rhyhorn was 100%. That being said, I only check for level 20+ relevant Pokemon in general. So it could be very good that I transfered other 100 IV Pokemon.

My egg hatches I check more frequently, from my 580 egg hatches I had 100% IV Pikachu.

During the week or so before the Gen2 update, it seemed like half the pokemon I was catching were in the 66% or better appraisal ranges.

After the Gen2 update, the vast majority of pokemon I've caught have been in the under 50% appraisal range. I think the only Gen2 pokemon I've gotten that might be worth investing in have been from eggs.

I've caught ~11000 mons and evolved ~1500, so about 9400-9500 uniques mons. I only have 3 unique and none from eggs. 1 rattata, 1 pidgey and 1 jynx. I have a handful of 97.8%ers.

I would assume that some people just have dumb luck and some are using trackers to find the high IV mons - in addition to the rare mons.

Definitely from eggs, mons in the wild are rarely above 60% in my experience

Both my 100% IV were caught in the wild: Eevee which became Flareon with best moveset (not now because of overheat so FML right?) and I caught a 100% IV Gastly which got the worst moveset as Gengar (FML again amirite?). My best egg hatch ever is my 98 iv Chansey that I am walking up to a Blissy

They do exist. Ive hatched a few and caught a few while sitting in nests. Your best chance is hatching those eggs.

Ive managed to hatch:
2x Spearows
1x Ponyta
1x Togepi - Never evolving, keeping as a trophy
1x Chancy
1x Dratini
1x Magikarp
1x Phanpy - hard to find candies for this to evolve
1x Oddish
2x Tentacool

Needless to say I now have a kickass Dragonite DB/HB, Gyrados B/HP/ and Blissey ZH/DG.

Take not ive hatched over 2000 eggs and only about 11 of them are perfect IVs.

I've caught 7380 pokemon, Spinarak, Horsea, Diglett and Nidoran F is my wild ones with perfect IV.

275 eggs, Rhydon is my only one perfect hatch.

The answer (besides cheating) is partially luck. I have never run one of the scanners that show IVs. But the real answer is buying incubators. I have 15 100% Pokemon. The only ones that I am sure that I caught in the wild are
Snorlax
Rapidash
Fearow
Jolteon
Gengar
All of these were unevolved when I caught them of course except the Snorlax which I caught back when that bug had them with a better chance to have high IVs.

The ones I have hatched are
Gyrados
Jolteon
Crobat (X2)
Tentacruel
Cubone
Parasect
Persian
Victreebel
Dratini (opened Tuesday, will be my only Dragonite over 91% out of 6).

I had no idea about IVs when I started and went crazy catching everything. I'm not sure how many I tossed away in the first few weeks that may also have had perfect IVs. It is also worth noting that so far only the Jolteon, Fearow, and Parasect have the best movesets. The Snorlax has ZH/EQ.I think one of the Crobats got a good one but I am waiting for the new rankings.The rest have third best or worse movesets.

Edit to add I've hatched 2,147 eggs.

1830 is a pretty low number of catches...I don't think I got a 100% till I hit 7000 catches.

I now have 2 and am close to 8000 catches so as mentioned, odds are 1 in 4000 or so which means I am about average.

I don't spend much on incubators and collect some coins a day now, but only run 1 incubator at a time...

I recommend people also max out their Pokemon storage during the sale now since I highly doubt they would offer them at 50% often/again/till gen 3.

Before people say you only need 250, I think we can tell after this move change, I think it's wise to collect multiple moveset ones and if you do gyms a lot, a supereffective prestiging team takes up a lot of space.

9000+ catches and 700 egg hatches and I have caught one 100% IV mon and hatched 3 that I have kept.

5464 pokemon caught, being 223 of them hatched (I'm level 29 and never spent real money on the game). Of those, only one I caught wild (a Poliwag) and two hatched (one Charmander and one Paras).

Caught and hatched 14560 pokemon total. 5 100IV total, I hatched 4 and I caught one (that was an eevee and that was before I even care about IV and know how to check IV, I keep that eevee simply because I like eevee, I kept every eevee I caught that time.)

I have 2 pokemons with 100%. Both were catched in the wild. 1st was Eevee, which became Jolteon, and 2nd was Magikarp, which became Gyarados. Both were very low level.

Just keep catching and hatching. I've got 7,000+ catches and 500+ hatches and just 2 100% mons, both starmies. Did just catch an 0% ponyta, tho, so that was fun.

There is math involved in this... a wild caught pokemon can have IVs between 0-15... a hatched egg contains a pokemon with IVs between 10-15. That's really all there is to it. There's no trick and unless under extremely lucky circumstances people with multiple perfect or high iv rare pokemon are quite possibly cheating. I think a wild pokemon has a 1/4096 chance to be perfect, not sure about hatched.

To add more perspective on your 1,830 pokemon caught....

I caught 14,000+, and hatched 850... I have like 6-7 perfect 100% mons.

4809 caught, 246 eggs hatched.

1 wild catch that I know of which was a zubat, maybe I transferred a pidgey in the early days, who knows. 1 out of 4800 is pretty normal, stats range from 0-15 so the range is 16, 3 different stats means the number of different stat permutations is 16 x 16 x 16 = 4096.

that's not to say you're guaranteed a perfect iv pokemon every 4096 catches, but over a large enough sample size you could reasonably expect somewhere around that amount. 1830 catches is actually a relatively small sample size when you're dealing with odds this low.

4 from eggs, paras, 2 ekans and a geodude. egg ivs range from 10-15 so the range is 6, therefore the chance of a perfect iv pokemon should be 1 in 6 x 6 x 6 = 1 in 216, so I'm apparently quite lucky.

If you'd caught 10,000 and hadn't seen any 100IV mons, then I would start to decry your bad luck. But with less than 2,000 caught your overall odds of catching a perfect mon are less than 1/2 as it stands.

You need to capture more/hatch more, that's all.

I have quite a few 100%IV without the help of tracker. None of them was hatched. It was such a joy to appraise them after the catch and found out that they are 100%IV.