For a Nasty Plotting Thundurus you should run:
Thundurus@Leftovers
Prankster, Timid Nature 4 def/ 252 sp atk/ 252 spe
Thunderbolt
Hidden Power (Ice)
Focus Blast/Substitute
Nasty Plot
For a Prankster set you should run:
Thundurus@Focus Sash/Leftys
Prankster, Timid Nature 4 def/ 252 sp atk/ 252 spe
Thunderbolt
Thunder Wave
Hidden Power (Ice)
Taunt
Thunderbolt and Hidden Power Ice are staple on thundurus, whether in the rain or out. T-Bolt is an accurate replacement for Thunder. On Nasty Plot Thundurus, Focus Blast may bite you in the *** a bit, if so you should use Substitute, set up the sub on a switch out, then proceed to Nasty Plot and kill everything with its base 111 speed, with full investment, and Timid nature.