Since Pay Day has been temporarily implemented as an event by Walross when we had the server issues not long ago, I've thought of an idea about it.
Instead of leaving it only for events, we could implement it permanently for a 10% to 20% increase instead of the event-only 50% increase in pokedollar gain.
My reasoning for this is that Meowth can be caught as early as in Route 6 and could be a decent source of money farming for newbies while they farm exp in wild pokes to fight Lt Surge and other story gyms they have to go through. Aside from that, it could help some of those who grind daily on Cerulean Cave or Dragon's Den for money and experience.
In Events, this could be increased to the event-only 50% or also in special occasions.
Aside from that, I think a 10% to 20% increase is balanced and fine. Inflation is most likely not going to happen as long as only a few use this (not everyone has CCave access and not everyone has competitive tools to obtain PvP ready Meowth / Persian with Pay Day and Technician). I've thought a lot about it and felt not too many users would use it, but since it can already help newbies, it could be fine. Furthermore, as long as the % is not too high (I think 25% was somewhat fine, but maybe already too high), I think it's implementable as an extra money gain, since money gain on the short term is irregular, while on the long term you eventually can count results and establish an exact amount per hour of money you gain.
My only argument against my own suggestion is that too many people use Pay Day farming in those specific spots nonstop and the server's economy inflates, but considering there are way better options to make money, I think it's not such a bad idea.
(Also, sorry if I made this too long, but I did not want to make it short or too simple).