Hmm i think roost would be better with scyther if you want use attacker use band or scarf
Scyther @ Choice Scarf
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- U-turn
- Aerial Ace
- Brick Break
- Bug Bite
you can use Quagsire or Gastrodon with scyther they are resisting rock-electric-fire and gastrodon checks scald
your team is so bulky nasty plot aloraichu can easily sweep this team.
Gastrodon @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Recover
- Scald
- Earthquake
- Toxic
Alola Raichu would be better than Manectric Raichu faster than Manectric and have better movepool surf/psychic/focus blast
Raichu-Alola @ Choice Specs
Ability: Surge Surfer
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Volt Switch
- Thunderbolt
- Psychic
- Surf
or
Raichu-Alola @ Aloraichium Z
Ability: Surge Surfer
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Thunderbolt
- Psychic
- HP Ice/ Focus Blast
If you don't want give up on Manectric use this set
Manectric @ Choice Specs
Ability: Lightning Rod
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Volt Switch / U-Turn - Volt Switch momentum with scyther. Scyther can bulky grass types
- Thunderbolt / Strong Stab Move
- Flamethrower / For grass types
- Switcheroo / If you dont need specs anymore and oponnent have annoying wall like clefairy or regirock you can give it specs..
sorry for bad grammar i think you understand