I'd like to add to or change the Tirtouga defensive set, with the set below:
Tirtouga @ Eviolite
Ability: Solid Rock
Level: 5
EVs: 164 HP / 52 Atk / 92 Def / 156 SpD / 20 Spe
Careful Nature
- Aqua Jet/Liquidation
- Knock Off
- Stealth Rock
- Stone Edge
imo this set is better than the current defensive set on the smogon website. Rather than passively fishing for scald burns with its weak special attack stat, this takes takes advantage of Tirouga's strong attack stat to deal with flying types - primarily vullaby. This set can switch into flying types with or without its evio still intact, and then has great utility with strong STABs, knock off or stealth rocks.