Here are some concerns to address with these suggestions.
This will first of all impact the economy in a bad way.
With the donator bonus active, and this 500% boost, you can easily make over 3000 per Pokemon in Cerulean Cave or other high-level spawn locations.
If something like this should exist, I would consider lowering it to 150% and cap the max Pokemon reward too 4000.
And, considering that some trainers will always give a high output rewards, even as regular trainers, it could cause a unstable economy since it only costs 5 Coins.
This will ruin the Ev training in general, which are an important factor to PRO and its economy.
Safari is a good way to EV train and is also serve as a good money sink. Whilst people also ask others to EV train for them, and pay a good sum for it. Which circles the economy.
If this should be a thing, you could freely choose to boost from 1 up to 63 on a particular value. Making it more expensive to use, and it won't ruin the EV training completely.
This will completely remove the way to move around the game.
Teleportation, Saffron train station, or other methods that requires a payment, would be less used and less money drained from each player.
There is no way to implement this without it having somewhat a negative impact on the economy. Its a reason HM Fly is not available in-game.
This is impossible.
PRO has no good filter system, and I doubt that they could make one that would be completely flawless for such a thing.
This would sadly be abused to a point where it would only get removed.
Global messages should be solely used by PRO to promote important information.
I don't know why you would change the Pokemon, since the tier remains the same. And people don't hunt it, like they would with a "outbreak".
Its a reason its called "World Quest", its to submit a Pokemon, which gets deleted.
The way the World Quest works is that they select a Pokemon in a list with tier 8 or 9 pokemon at random.
Then a message appears in the in-game chat, a icon is displayed in-game and the Mysterious Cultist is activated.
After all this, someone MANUALLY posts a message on Discord, with the required IVs, Pokemon and which route its located in.
Changing a Pokemon, even if its less then 5 minutes since it started, the majority of players use Discord as their main source of information for PRO.
Also, people would already had spent a big sum of money to get to the area it spawns in (i.e travling from Kanto to Sinnoh, to hunt in Route 225, requires a lot of walking + boat expenses)
This would only serve as a big confusion for people and eventually they would hunt in two different places.
Because a majority of players would look at Discord once, go hunt. While others won't even know it changed.
Regardless if a message is posted in in-game chat, the only source for them to know it was changed, if they logged back in or server crashed, would be the Mysterious Cultist.
There are so many small things that would have to be looked over in order to make this even possible. Too much hassle.
As for the rest, they are okay. Some tweaks and they could be doable.
-1 to the ones I highlighted and commented on.
+1 to the rest