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Save before fight so you can simply restart each time you fail to capture them. Thank god there’s no Mr. Resetti
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induce Paralysis (thunder wave usually)
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mid/super effectiven attacks to whittle down health
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use pokemon with False Swipe only if they dont have moves to hurt themselves. If they do, best you can do is save be


My Gen3 strategy is similar, but using Spore (sleep) instead of Thunder Wave. Breloom, Parasect, Smeargle all learn that combo. I like to use Smeargle with Thief as it doubles to farm junk like shards and whatnot.