I know you don't tend to use this type of team, but in case you're feeling adventurous I have a fat balance build for you to try out. https://pokepast.es/1a38326f12ae9a90 Got to ~1710 (top 50) with it.
Rundown on EVs: Tyranitar outspeeds -Spe Groudon and lives Gengar's Focus Blast from full, and Giratina lives 2 Groudon Eruptions from full.
Rundown on EVs: Tyranitar outspeeds -Spe Groudon and lives Gengar's Focus Blast from full, and Giratina lives 2 Groudon Eruptions from full.