total theorymon here but a scarf Raikou (541 speed) with
Thunderbolt
Shadowball
Hp grass
Thunder
would pretty much destroy rain teams. With a timid nature you outspeed neutral 252 qwilifish( 538 Speed)
Sweeper ludicolo which is neutral and has the highest Sp Def from the sweepers takes 59.80% - 70.76% from a timid Thunder
Although
Modest Life orb Ludicolo does 79.75% - 94.39% in return
Adamant Life orb Kabutops 50.47% - 59.81% with Aqua Jet
Scarf Raikou might be able to take out Rain Dance teams, but if that set was up against anything else it would do horribly. Thunderbolt and Thunder on the same set is redundant, and since you're not guarenteed 100% accuracy with Thunder, you'll be running Thunderbolt. That makes your calculations null and void, since you can't do as much damage with Thunderbolt. The idea itself wouldn't be terrible to test, but the moveset really needs reevaluated to be worthwhile on a team aiming to win.