Giratina @ Leftovers  
Ability: Pressure  
EVs: 252 HP / 204 Def / 52 SpD  
Relaxed Nature  
IVs: 30 Spe  
- Defog  
- Rest  
- Will-O-Wisp / Toxic  
- Spectral Thief
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Optional Move(s):
- Sleep Talk
- Dragon Tail
Optional Item(s):
- Colbur Berry
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Overview:
Giratina has a number of unique traits that lets it fit on defensive teams. Its unique typing and great bulk lets it avoid getting trapped by Shadow Tag users, ability to spinblock and blanket check some dangerous pokemon, including Primal Groudon, Mega Blaziken and Kartana. Pressure is a useful ability to easily outlast opponent's hazards and low PP moves such as V-create, Sunsteel Strike and Steam Eruption. However, it lacks a reliable recovery, which make it prone to being worn down easily throughout the match. It is also passive and is reliant on its status moves, which might be unable to reliably handled Primal Groudon and Ho-oh if running Will-O-Wisp or reliably handled Kartana and Mega Lucario if running Toxic.