How to get the maximum of your current Pokemon storage space

First of all - yes. It does work for lower storage space individuals - i personally have 1000.

#1) since you are spoofing, regular legendaries arent all thst impressive. So, searching something like: "legendary, ultra beast, mythical & raid & !shiny & !lucky & !background & 2*,1*" - could find you every legendary that holds almost no value in trading or playing whatsoever. Ofc be careful not to transfer mons you are using in GBL or hold sentimental value of some sort.

#2) sorting mons from oldest. Since you have atarted you probably have accidentally saved a bunch of random mons for no reason. Looking through your oldest mons will help you find a good amount of them.

#3) looking JUST above 2.5k CP. In this range of 2.5k-3k youll find the least useful mons.

#4) shinies you have in bulk. Whether its a community day shiny or just a mon youve gotten multiple shinies of for no reason.

Using all those you should always have about 200 free space in you storage no matter what.

Any insights and advice welcome

Hope i helped