Well, here's a Golduck no one would really expect
Bulky Stall Golduck
Ability: Cloud Nine
Item Held: Leftovers
EVs 252 Def 252 HP 4 Sp. Atk
-Scald STAB, chance to burn, and will increase your Def
-Mud bomb, lowers accuracy, annoying the opponent so they can hardly ever atttack and deals with Electric types
-Calm Mind. Boosts Sp. Atk. and Sp. Def with Scald and Mud Bomb
-Substitute Creates a temporary replacement so you can be safe while attacking and gaining stats and HP.
Okay, not everyone would okay with a Golduck that can pass off as Bulky, but it can. Here, you attack by gaining your defenses up. Scald takes care of those who are NOT fire type or have Water Veil as an ability, those will be your counters that can NOT get burned. Well, we can resort to Mud Bomb as well, so long as they are NOT flying type and/or have Keen Eye/White Smoke/Clear Body as their ability. So if you are lucky to bypass with a Burn and/or lowered accuracy, then you can utitlize by setting up Calm Mind to enhance the Special side offensively and defensively, and Substitute, so you can have a decoy, especailly whether the opponent is struggling to make an attack, try to use a defensive/supportive move, or switch out, at least the Special Boost and Substitute will aid you there.