Tried out Raichu a little since people are talking about it a lot lately.
Raichu rarely seems to use attacks other than Thunderbolt or HP Ice. Grass Knot is mostly for Quagsire and Gastrodon, while Surf is mainly for Steelix. HP Ice actually has a good chance to KO Su(p)perior with Life Orb, Stealth Rock, and a Nasty Plot. Because it does pretty well with two moves, the Encore + Nasty Plot set actually works pretty well in it's dual role. The big glaring problem is Dugtrio, though, so I recommend using something to lure and kill Dugtrio.
If you want Raichu to beat Dugtrio, Substitute is probably your best option. Running Substitute on the sweeper set is viable but turns it into a worse Raikou. The Sub-Punch set can OHKO Dugtrio with Focus Punch, and still gives you that fast Encore, so it might be worth a try if you want to use Raichu. In fact, since that set uses Leftovers, you'll probably do a lot more Encoring with it than with the sweeper set. Speaking of luring Dugtrio, the Focus Punch set might be a good way to do that. You might also surprise Clefable and Chansey.
Other moves for scouting Dugtrio include Magnet Rise and Agility. Both are gimmicky, but Magnet Rise could help you set up big time against Steelix, Registeel, and Claydol. Overall I found Raichu to be decent, but it has trouble doing something better than Raikou.
Hehe nice... The more the merrier dude. (Nice summary)
Yeah Raichu's decent I'm not going to argue that he's super viable. But if you want something new, give Raichu a spin.









