High Physical Defense:
* Rhyperior: This Ground/Rock type has incredibly high Physical Defense and can also hit hard with Rock-type moves.
* Steelix: Steel type with high physical defense, though it struggles against Fire and Fighting-type moves.
* Gliscor: Ground/Flying type with excellent defense and decent Special Defense.
* Hippowdon: Ground type with incredible physical defense, though weak to Water and Grass-type moves.
* Skarmory: Steel/Flying type with excellent defenses, though weak to Fire and Electric-type moves.
High Special Defense:
* Blissey: Normal type with unmatched Special Defense but very weak to Fighting and Steel-type moves.
* Cresselia: Psychic type with high special defense and a variety of utility moves.
* Lickilicky: Normal type with surprisingly good special defense.
* Regice: Ice type with incredible Special Defense, but weak to Fire, Fighting, and Rock-type moves.
* Snorlax: Normal type with high special defense and a good movepool, but weak to Fighting-type moves.
Balanced Defenses:
* Mamoswine: Ice/Ground type with good defense, but struggles against Fire, Fighting, and Grass-type moves.
* Garchomp: Dragon/Ground type with good defense and strong attacks, but weak to Ice, Dragon, and Fairy-type moves.
* Aggron: Steel/Rock type with decent defenses across the board, but weak to Fighting, Water, and Ground-type moves.
For Specific Team Needs:
* For Tanking Physical Hits: Rhyperior, Steelix, Hippowdon
* For Tanking Special Hits: Blissey, Cresselia, Regice
* For Mixed Defenses: Garchomp, Aggron, Mamoswine
Remember to:
* Consider the weaknesses of your chosen Pokemon and build a team to cover those weaknesses.
* Use items like Leftovers to passively heal your Pokemon.
* Train your Pokemon's defense stat to maximize their effectiveness.
No matter your playstyle, there's a defensively strong Pokemon waiting for you in Diamond. Have fun exploring the region and finding your favorites!