Yes they do:
Tornadus-I = 3 Atk Tornadus-T = 3 Spd
Thundurus-I = 3 Atk Thundurus-T = 3 SpAtk
Landorus-I = 3 SpAtk Landorus-T = 3 Atk
Kyurem = 1 HP/Atk/SpAtk Kyurem-B = 3 Atk Kyurem-W = 3 SpAtk
Credit to Pokemaster for that.
