Redoing the whole thing.
Feraligatr (M) @ Leftovers
Trait: Torrent
EVs: 252 HP / 108 Atk / 8 Def / 140 SDef
Adamant Nature (+Atk, -SAtk)
- Waterfall
- Dragon Claw
- Dragon Dance
- Counter
Counter on a sweeper? Yes. Feraligatr is able to take hits and Counter hits pretty hard. Take Swampert as an example, whose Earthquake does between 33-39% to Feraligatr. If you Dragon Dance on its switch-in, Counter back its stupid Earthquake, which brings it to maximum 37% HP. Then Waterfall, 39-45% damage, Swampert gone.
Also Counter works on some other idiots like Rhyperior (OHKO with CB, 67-78% without).

Feraligatr (M) @ Leftovers
Trait: Torrent
EVs: 252 HP / 108 Atk / 8 Def / 140 SDef
Adamant Nature (+Atk, -SAtk)
- Waterfall
- Dragon Claw
- Dragon Dance
- Counter
Counter on a sweeper? Yes. Feraligatr is able to take hits and Counter hits pretty hard. Take Swampert as an example, whose Earthquake does between 33-39% to Feraligatr. If you Dragon Dance on its switch-in, Counter back its stupid Earthquake, which brings it to maximum 37% HP. Then Waterfall, 39-45% damage, Swampert gone.
Also Counter works on some other idiots like Rhyperior (OHKO with CB, 67-78% without).