Welcome to my GUIDE ;;
Today I am gonna to state all WAYS TO MAKE MONEY OR SAVE MONEY which I recommend highly.
1. Dig spots
Doing Dig Spots regularly
will help you making 100-200k Once.
My Recommendation - Go for Dig Spots with Best Sync to catch Rare Pokes.
If you gotcha a rare poke even with decent IVs it gives possibility to make 100k-2m easily.
2. Bug Catching Contest
BCC can give you 25k / day. But this is also depends on Pokemon you submit.
If you are lucky enough you can even get 100k for an shiny.
My Recommendation - Use BCC as hunting Place for those pokes who are rare OR can't be find out of BCC [ ONLY LARVESTA ]
3. BOSSES
Completing each and every boss consecutive.