Mono/dual =
Same number of types (mono/dual)
The Mono/dual = connection is one of the types & combat rules in the daily PokéWired Pokémon puzzle. Two Pokémon are linked by it when this holds: Same number of types (mono/dual).
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 mono/dual = connection:
Venusaur#3Mono/dual =
Charizard#6Both are dual-type
Charizard#6Mono/dual =
Butterfree#12Both are dual-type
Blastoise#9Mono/dual =
Raticate#20Both are single-type
Butterfree#12Mono/dual =
Beedrill#15Both are dual-type