Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
- Hydro Pump
- Volt Switch
- Defog / Will-O-Wisp / Toxic
- Pain Split
Rotom-Wash is a VERY good partner for Scarf Jirachi. It forms a VoltTurn core with it, checks stuff like Krookodile for Jirachi, and can even Defog away hazards so Jirachi isn't in range of being obliterated by a surprise Sucker Punch from Lycanroc-Dusk, or just being nailed by Salamence or etc. Overall, besides the type synergy and support, Rotom-Wash also allows Jirachi to take advantage of Chansey or other special walls with Trick.
(Trick should be a slash, and why are you not Fire Punch so Aegi doesn't just come in?)