I'm gonna focus on Kanto Raichu since the Alola form has been taken care of.
Item: Focus Sash
EVs: 252 Sp Atk and Speed, 4 HP
Moves: Thunderbolt, Grass Knot, Focus blast, nasty plot
the format here is single battles and set should go without saying. First move for stab, other two for coverage and last move to boost special attack on first turn take a hit through the sash then try to sweep.
You can also use the above set in a double battle teamed up with a pokemon that has the drizzle ability like pelipper, kyogre, or politoad. In that case tho thunderbolt would be replaced with thunder and nasty plot with protect. Lightningrod also is a huge benefit to all drizzle users espically pelipper.
My alpha sapphire in game name is kisame. My pokemon moon in game name is Matthew.
3DS FC: 1564 3843 9409 (If you add me let me know so I can add you.)