Okay, taking a little break from the sun discussion to talk about a cool core I've used a few times, including in my PUPL game against Montsegur:
Raichu @ Life Orb
Ability: Lightning Rod
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Nasty Plot
- Thunderbolt
- Focus Blast
- Hidden Power [Ice]
Zebstrika @ Life Orb
Ability: Sap Sipper
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Volt Switch
- Thunderbolt
- Overheat
- Hidden Power [Grass]
This core takes inspiration from double dragon cores in other tiers. Basically, Nasty Plot Raichu breaks through things like SpD Roselia, Piloswine, SpD Clefairy, and Grumpig, which clears the way for Zebstrika to clean up with its main checks weakened. There's still a few things which annoy it though. For example, Vibrava doesn't switch into Raichu because they always carry HP Ice, so it's hard to get it to come in. Depending on which Electric checks the opponent has it can also work in reverse; if they're things like Clefairy and Grumpig you can spam Volt Switch with Zebstrika to wear them down and pressure them so that they're in +2 Raichu range. Overall this is a neat core that features a great and underrated set in NP Raichu and is pretty effective in this meta.
Raichu @ Life Orb
Ability: Lightning Rod
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Nasty Plot
- Thunderbolt
- Focus Blast
- Hidden Power [Ice]
Zebstrika @ Life Orb
Ability: Sap Sipper
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Volt Switch
- Thunderbolt
- Overheat
- Hidden Power [Grass]
This core takes inspiration from double dragon cores in other tiers. Basically, Nasty Plot Raichu breaks through things like SpD Roselia, Piloswine, SpD Clefairy, and Grumpig, which clears the way for Zebstrika to clean up with its main checks weakened. There's still a few things which annoy it though. For example, Vibrava doesn't switch into Raichu because they always carry HP Ice, so it's hard to get it to come in. Depending on which Electric checks the opponent has it can also work in reverse; if they're things like Clefairy and Grumpig you can spam Volt Switch with Zebstrika to wear them down and pressure them so that they're in +2 Raichu range. Overall this is a neat core that features a great and underrated set in NP Raichu and is pretty effective in this meta.