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Swift will always hit the opposing Pokémon, ignoring accuracy and evasion modifiers. It can also hit Pokémon who are in the charge turn of Fly or Dig.
Swift has a small niche in being able to hit Pokemon using Fly and Dig and never failing, but it's not powerful enough and these moves are never seen competitively. Use other Normal-type moves instead.
Body Slam is a more powerful alternative which boasts a 30% paralyze chance.
Double-Edge is a much stronger option with recoil.