The majority of Incarnate Forme Thundurus don't run Timid max speed. It's more common for them to play the role of a support pokemon & have a defensive nature. Usually the nature of choice is calm [+spD-atk] this is b/c with Incarnate Forme Thundurus ability prankster you can still get off thunder waves & taunts on faster Pokemon. This style of Thundurus can still have some offensive pressure b/c usually when Thundurus will attack its uses thunderbolt or hp ice on a Pokemon that it's super effective against.
This is an example of a old Thundurus ev's spread from past VGC meta games. It would be good to start with something similar to this and tweak the ev's to your liking and for whats now common in VGC 15
using https://pokemonshowdown.com/damagecalc/
Thundurus (M) @ Sitrus Berry
Trait: Prankster
EVs: 196 HP / 204 SDef / 108 Spd
Calm Nature
– Thunder Wave
– Hidden Power [Ice]
– Taunt
– Thunderbolt
Black117's example spread is also very good if your team needs thundurus to survive physical rock attacks
Also something to consider, it takes 100 EV's for calm thundurus to outspeed 252 adamant non choice scarf lando-T.
0 spa EV calm thundurus does 82-97% to a 252 speed 252 atk lando-T
you can still have effective offensive pressure without spA investment
This is an example of a old Thundurus ev's spread from past VGC meta games. It would be good to start with something similar to this and tweak the ev's to your liking and for whats now common in VGC 15
using https://pokemonshowdown.com/damagecalc/
Thundurus (M) @ Sitrus Berry
Trait: Prankster
EVs: 196 HP / 204 SDef / 108 Spd
Calm Nature
– Thunder Wave
– Hidden Power [Ice]
– Taunt
– Thunderbolt
Black117's example spread is also very good if your team needs thundurus to survive physical rock attacks
Also something to consider, it takes 100 EV's for calm thundurus to outspeed 252 adamant non choice scarf lando-T.
0 spa EV calm thundurus does 82-97% to a 252 speed 252 atk lando-T
you can still have effective offensive pressure without spA investment
