I feel like Harmony's economy is unstable, I never got to experience how broken Chaos' economy was, but if it killed the whole server then that worries me.
Why I believe the economy's unstable:
1. The prices of all pokemon gradually decline as they become more common, a major case being Manaphy. Manaphy used to sell for ~450k-500k because it was a rather common legendary, albeit still a chance spawn, Manaphy now sells for ~250k. The legendary bird trio used to sell for ~200k, but now there's hardly any of them on /ah because they don't really sell anymore. The creation trio used to sell for ~600k-700k+ but as they've become more common, they've lost relevancy in the market, dropping in price and appearance.
2. Crate rotations manipulate the market SO heavily. Before the TurKey crate, the Forces of Nature (Landorus/Thundurus/Tornadus) sold for ~650k-800k, however they became so common because of the crate that their price dropped to 300k. A br Marshadow before halloween was the typical ~5m, now a br marshadow is ~3.5m. On the other side of the spectrum there's special skinned pokes that were in previous rotations which have (some) become so rare that nobody sells them because they've become a collector's item.
3. While the price of the Pokecoin is arguably deflating, they're still produced at a stagnant rate. Payday farming and selling items to shopkeepers will always give the same amount of money. Because there aren't many things that are worth buying from the shop, few players actually fill the void that was created when someone slapped a shuckle with payday or sold a star piece. The price conversion from Pokecoin to USD has stayed relatively the same, aside from a slight deflation in the pokecoin, at ~1m = $1. At maximum efficiency (Lvl 110, HH, AC) shuckle farming it's possible to gain ~5m/hr. This is the curse that ALL RPG economies suffer from; the players infinitely producing money until they complete all their goals, then amble on with nothing to do with their hoard of stuff.
4. The players with the most money seldom have something to spend it on if they're max rank. The only thing you can really do once you reach baltop is start forming collections, start building, or perhaps start building teams. The player's goals loosen as you gain money. If they wanted to collect every legendary, then they just get it alongside their rank. The most permanent thing to do once you reach that play-or-pay barrier is to do quests, but most players don't want to do quests because they're generally 85% waiting for something to spawn and 15% killing/catching that something.
5. The battle points shop doesn't have a very relative conversion with Pokecoin. You can get a prison bottle or meteorite for 32 bp, which sell for ~10k, a mega stone for 64 bp, which sells for 15k-35k, or a red/blue orb (or red chain) for 100bp, which sell for ~500k.
I've seen this in other pixelmon servers and I think it may help ours, but generally there's a way to sell or trade pokemon for other rewards. In the server I played you could sell pokemon to an NPC for Pokecoin, this created a pokemon void to help cap the prices on pixelmon. Because we don't have a system like this, the only time pixelmon are taken out of the economy are when they're released, or when the player who owns that pixelmon stops playing the server. This results in the demand for pixelmon shrinking more and more, and therefore deflating, but because there's no cap for how much that price can deflate, the market can become irrational, such as with the Forces of Nature.
We could also optimize the battle point shop better with respects to the auction house prices.
I don't have sure proof that anything's wrong with Harmony's current economy, but I just felt like it was changing, and change isn't always good.