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I'll assume you mean resistances by type only and not when it comes to actual stats. If that's true, then Magnemite and its evolutions have the most resistances (twelve total, one immunity).
As what Shookie said, the Magnemite line (Since Gen. 2) has most Resistance (11) plus One Immunity. If you are that concerned to learn Magnet Rise, the total would be Thirteen because Magnet Rise give your 'mon a "Levitate" effect which make it immune to Ground-type Attacks (Which also removed Magnemite(or Ton or Zone)'s only Double Weakness).
Since this is already big enough and answered, I'll just lock, but next time, please use the help thread. Also, red saber, you're not a moderator, don't act like one. *deletes post*