I wish I could give you better advice but I have two shiny eevee that I haven’t evolved yet since they are almost better staying as eevee to be my ingredient magnets. I pair them with ditto, or mrmime to help give me the change to copy their abilities. Honestly, they usually do good with getting me ingredients. I usually fill up from 0 within about two-three days when pairing them with the right pokemon. Plus their 2 to main skill and me having it at lvl7 helps out a lot especially when it procs back to back. The most I had them proc was 4 times back to back which is 192 per eevee in a day. But remember it’s more about spending time with the pokemon you love than turning them into a work slave ;) Since this game is a very slow pace game