Weak to 2 types
Both have exactly two type weaknesses
The Weak to 2 types connection is one of the types & combat rules in the daily PokéWired Pokémon puzzle. Two Pokémon are linked by it when this holds: Both have exactly two type weaknesses.
It's not directional: it works both ways, so it doesn't matter which Pokémon goes on the left and which on the right. It belongs to the Hard rule set, so you'll only run into it in Hard puzzles.
Type connections are the backbone of most chains — they ask about a Pokémon's typing, its weaknesses and resistances, and how one type fares against another in battle.
Examples
Real Pokémon pairs that satisfy the weak to 2 types connection:
Blastoise#9Weak to 2 types
Arbok#24Both have 2 weaknesses — Blastoise: Electric, Grass · Arbok: Ground, Psychic
- Arbok#24Weak to 2 types
Clefable#36Both have 2 weaknesses — Arbok: Ground, Psychic · Clefable: Poison, Steel
- Clefable#36Weak to 2 types
Wigglytuff#40Both have 2 weaknesses — Clefable: Poison, Steel · Wigglytuff: Poison, Steel
- Wigglytuff#40Weak to 2 types
Golduck#55Both have 2 weaknesses — Wigglytuff: Poison, Steel · Golduck: Electric, Grass