Weak to 3 types
Both have exactly three type weaknesses
The Weak to 3 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 three 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 3 types connection:
Charizard#6Weak to 3 types
Pidgeot#18Both have 3 weaknesses — Charizard: Water, Electric, Rock · Pidgeot: Electric, Ice, Rock
- Pidgeot#18Weak to 3 types
Fearow#22Both have 3 weaknesses — Pidgeot: Electric, Ice, Rock · Fearow: Electric, Ice, Rock
- Fearow#22Weak to 3 types
Sandslash#28Both have 3 weaknesses — Fearow: Electric, Ice, Rock · Sandslash: Water, Grass, Ice
- Sandslash#28Weak to 3 types
Ninetales#38Both have 3 weaknesses — Sandslash: Water, Grass, Ice · Ninetales: Water, Ground, Rock