Counters to Fairy-type team
One of the most used types are fairy, because of Klefki's Prankster and Togekiss's Serene Grace with Air Slash. Also for deal with the Pseudo-legendaries dragon-type.
Klefki also works well in a steel-type team, Heatran covers the fire moves.
I'm going to give you some tips on how counter a fairy-type and what happen if you get a weakness to your team.
Ok, so fairy-type are weak to steel and poison and that's were I'm going to start.
•Immunity to poison/toxic.
•Great amount of dual types.
•Good checks against their main counters (fighting,ground and fire).
•Acces to both Stealth Rocks and Spikes.
•Has a spinner.
•Big variety in 'jobs'. (Physical walls,Physical attackers, etc.).
•Resistances against many types.
•No real fast steel Pokemon except for Arceus.
•Lacks reliable recovery apart from Scizor and Skarmory.
•Infernape is almost always an instant win against Steel teams (Flare Blitz/Close Combat).
•Immune to Fighting: Aegislash
•Immune to Ground: Flying, Bronzong
•Immune to Fire: Heatran
•Neutral to Ground: Scizor, Wormadam-S, Forretress, Genesect, Durant, Escavalier, Ferrothorn
•Neutral to Fire: Dialga, Aggron, Bastiodon, Probopass, Empoleon
•Neutral to Fighting: Scizor, Wormadam-S, Forretress, Genesect, Durant, Skarmory, Bronzong, Jirachi, Metagross
•Weaknesses covered by those with immunities (Drapion, Levitators, Crobat).
•Has some of the fastest Pokes in the meta (Gengar, Scolipede, Crobat).
•Wicked mixed coverage.
•Can use Black Sludge over Leftovers to screw over Trick users.
•Plenty of support options, all well equipped with entry hazards.
•Does pretty well in both rain (Tentacruel, Toxicroak) and sun (Venusaur).
•Spore user (Amoonguss).
•Limited in typing combinations
•Weezing and Tentacruel are the only viable walls against Physical and Special sweepers respectively
•Only Natural Cure Roserade and Shed Skin Arbok can comfortably switch into all status. Gengar, the Nidos, and Toxicroak block Body Slam, T-Wave, and Scald respectively.
•Only spinner is Tentacruel.
•Only members immune to sandstorm are the Nidos.
•Pretty much open to Psychic sweep without a Dark-type or Scarfed Sweeper I know from experience that Scarf Gengar, LO Toxicroak Sucker Punch, Scolipede, and especially Scarf. Drapion can take down Psychic threats and Pokemon like Nidoking and Roserade bully slower Psychics with extremely powerful STAB.
•Can't deal with Dragon attacks outside of "switch to lone wall". However, Scarf Gengar can easily revenge Dragon Pokémon.
•Immune to Psychic: Drapion, Skuntank
•Immune to Ground: Crobat, Gengar, Weezing
•Neutral to Ground: Ariados, Beedrill, Dustox, Scolipede, Venomoth, Amoongus, Roserade, Venusaur, Victreebel, Vileplume
•Neutral to Psychic: none
If you want another answer with some counters to a type you wish to know, just tell me.
Hope this helps.