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Update as of Gen-8 (Jan 2021)

7 weaknesses
GRASS / ICE (3)
GRASS / PSYCHIC (4)
GRASS / DARK (4)
FIGHTING / ROCK (1)
PSYCHIC / ROCK (2)
ROCK / DARK (2)

Dual type chart in this site mentions 6 dual types having 7 weaknesses, i.e. the most no. of weaknesses.

Grass & Ice: Abomasnow line
Grass & Psychic: Exeggutor line, Celebi and Calyrex
Grass & Dark: Shiftry line (not Seedot), Cacturne and Zarude
Rock & Fighting: Terrakion
Rock & Psychic: Lunatone and Solrock have Levitate, so no Ground Weakness. They are ruled out.
Rock & Dark: Tyranitar and its Mega.

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There are three types that have 7 weaknesses - the most of any combination:

  • Ice/Grass
  • Psychic/Grass
  • Psychic/Rock

Lunatone and Solrock are the only Psychic/Rock Pokemon but they also have Levitate which means they only have 6 weaknesses (and no double weakness).

Exeggcute, Exeggutor and Celebi are Psychic/Grass - weak to 7 types including 4x to Bug.
Snover and Abomasnow are Ice/Grass - weak to 7 types including 4x to Fire.

Those 5 are statistically the weakest Pokemon.

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Also Tyranitar now. They're not the weakest pokemon, just have the most weaknesses.
Grass/Dark is another with 7