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Design-wise: Thundurus-I b/c I really like the color blue and electric types. Plus ThunderBlunder777's videos warmed me up on Thundy, especially the Heatah Fajita series
Competitive: Tornadus-T bodies stall since he can 2HKO mega sableye, skarmory, unaware clef, unaware quag, and toxapex with hurricane and and heat wave with a life orb. Regen and U-turn keep momentum. Plus he's got knock off for chansey/shed shell skarm. Oh and since he's flying type, he doesn't get trapped by dugtrio and he outspeeds Dugtrio anyways