Both dual
Both are dual-type
The Both dual connection is one of the types & combat rules in the daily PokéWired Pokémon puzzle. Two Pokémon are linked by it when this holds: Both are dual-type.
It's not directional: it works both ways, so it doesn't matter which Pokémon goes on the left and which on the right. You'll meet it in Normal puzzles, and it can also show up in the Unlimited and Chain modes.
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 both dual connection:
Venusaur#3Both dual
Charizard#6Both are dual-type
Charizard#6Both dual
Butterfree#12Both are dual-type
Butterfree#12Both dual
Beedrill#15Both are dual-type
Beedrill#15Both dual
Pidgeot#18Both are dual-type