Hey guys, what do you think about my global showdown team? Comments please.

Liepard @ BrightPowder
Trait: Prankster
EVs: 252 Spd / 248 HP / 8 Def
Jolly Nature
- Thunder Wave
- Swagger
- Substitute
- Foul Play

Deoxys-Defense @ Light Clay
Trait: Pressure
EVs: 252 SDef / 252 HP / 4 Def
Calm Nature
- Stealth Rock
- Spikes
- Reflect
- Light Screen

Dialga @ Leftovers
Trait: Pressure
EVs: 252 Def / 252 HP / 4 Atk
Impish Nature
- Dragon Tail
- Rest
- Roar
- Sleep Talk