Item: Leftovers
Ability: Regenerator
EVs: 252 HP, 200 Def, 56 SpD
Nature: Calm
- Spore
- Giga Drain
- Stun Spore
- Clear Smog / Substitute
Amoonguss is surprisingly bulky, as we all know, and carries two different statuses that will stop cold not only Kingdra, but all Swift Swimmers commonly found in UU. Your opponent's rain also gives Amoonguss great protection against Fire-type moves.
Spore is always found on Amoonguss, and can cause a lot of switches if you are unaffected by Sleep Cause, while Stun Spore can be a huge surprise against Kingdra, effectively cutting off Swift Swim. Remember that Kingdra will still outspeed Amoonguss if it has a Dragon Dance under its belt or if it is raining. Amoonguss' Grass/Poison typing, especially under rain, is very beneficial against Kingdra lacking HP Fire (very rare on Kingdra), and helps to take away HP from Kingdra with its STAB Giga Drain, a neutral hit. It is known that on occasion Kingdra will use Dragon Dance. Because of this, Clear Smog can be used to force a reset on the boosts Kingdra has obtained. However, Substitute is of mention in the final slot to ease prediction. 108 HP Substitutes are no joke against Kingdra, able to withstand a Hydro Pump in rain. It also allows Amoonguss to potentially dodge a fatal hit from Outrage.