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Whenever I catch a Pokemon that I want to use, I save edit them so that their IVs are all 15, their Nature is neutral, and their EVs are 88/84/84/84/84/84. I keep all of my Pokemon completely average for my casual playthroughs, so RNG or casual disregard for EVs aren't helping or hurting my Pokemon.
I'll also save edit Pokemon so they have moves or Abilities I feel like they should have (such as giving Aurorus Power Gem or giving Gourgeist Flash Fire).