I’d make these 10 changes first:
- Starmie: fully commit to physical Huge Power
Keep it as:
Liquidation
Ice Spinner
Psycho Cut
Protect
With 32 Atk / 32 Spe Jolly. Don’t split into Sp. Atk at all.
- Use Mega Starmie as the main rain Mega
In most rain games, Starmie should be the main Mega. Huge Power + rain Liquidation is much more threatening than trying to force Manectric every game.
- Manectric: Thunder → Thunderbolt
Thunder is nice in rain, but if rain disappears, Manectric becomes awkward. Thunderbolt is way more consistent.
- Manectric: keep Volt Switch
Volt Switch is one of the best reasons to use Manectric. It lets you pivot, reset positioning, and bring Pelipper or a rain attacker back in safely.
- Pelipper: test Damp Rock over Focus Sash
This team has multiple Pokémon that want rain turns. Longer rain helps Starmie, Archaludon, Toxicroak, and Overqwil.
- Pelipper: Protect → Wide Guard
Wide Guard helps a lot into Rock Slide, Earthquake, Heat Wave, Eruption, Blizzard, and Make It Rain. That is huge for a rain offense team.
- Archaludon: Draco Meteor → Dragon Pulse
Draco is strong, but the miss chance and Sp. Atk drop can make games messy. Dragon Pulse is cleaner and keeps Archaludon useful for longer.
- Archaludon: Metal Coat → Life Orb
Metal Coat only boosts Flash Cannon. Life Orb boosts all of Archaludon’s damage, including Electro Shot and Dragon Pulse.
- Toxicroak: Sucker Punch → Protect
In rain, Protect is really good with Dry Skin recovery. It also helps Toxicroak stay alive longer for Fake Out pressure.
- Overqwil: Toxic → Crunch
Toxic is too slow for this kind of team. Overqwil should be using rain speed to pressure immediately. Gunk Shot / Crunch / Haze / Protect is much cleaner.