Here's something that will raise eyebrows, but believe it or not, I've been using it to surprising success in competent battles with other opponents. And before you dismiss it, keep in mind that there is nothing that outclasses its niche in OU, and therefore has a definite place in the metagame that cannot be disregarded. Also note that I'm not the greatest team builder, so the teammates section and specific pokemon that Raichu can hit aren't exactly my forte. Anyway:
Raichu @ Life Orb / Choice Band
Ability: Static / Lightningrod
EVs: 4 SpA / 252 Atk / 252 Spe
Hasty / Lonely Nature
- Volt Tackle
- Brick Break
- Knock Off
- ExtremeSpeed / Grass Knot
Role: Physical Attacker, Late-Game Cleaner, Revenge Killer
What It Does: Despite being in an era where bulky attackers reign supreme, Raichu's blistering base 110 speed, mixed base 90 offenses, access to a powerful STAB in Volt Tackle, and passable coverage for both of his offensive stats, Raichu has a very defined niche as one of a handful of viable physical attackers with powerful Electric STAB. Its high speed lets it outrun a large variety of threats, and STAB Volt Tackle packs a huge punch, allowing it to check the rampant Flying-types through out the tier. Access to priority helps out greatly as well, especially since it's one of the fastest priority users. Combined with its coverage, Raichu can breeze through weakened teams with ease. Overall, an underrated Pokemon that certainly has its merits.
Good Teammates: If Raichu doesn't carry Grass Knot, anything that can break through bulky ground types, such as Mamoswine and Mega Charizard Y, are great offensive partners. Defensively, Mandibuzz and Skarmory can take pretty much any priority thrown at Raichu and help wear down other bulkier Pokemon that Raichu cannot otherwise OHKO
What Counters It: Talonflame, Scizor, or pretty much any priority user can wipe the floor with Raichu before it can even move. Additionally, physically defensive Ground-types wall this set hard if he isn't carrying Grass Knot.
Any Additional Info: While he doesn't look like an attractive choice at first glance, Raichu is a perfectly viable choice if your team needs powerful physical Electric STAB, an efficient late-game cleaner, or a prime-cut revenge killer. Used wisely, Raichu can be incredibly fun to use against confused opponents.
I know I'll be getting a lot of flak for this, but I've been using a similar set for some time and this thing has won games for me in clutch situations. Run some calcs and try for yourself first before you dismiss this. Thanks for your time.