I like it, but Triple Battle is little played.
I do recommend instead having it for doubles, and take these changes in account.
Politoed
Politoed @ Damp Rock:
Trait: Drizzle
EVs: 252 HP / 252 SDef / 4 Def
Sassy Nature
- Rain Dance
- Scald
- Perish Song
- Protect
Perish Song forces switches and allows Dragonite and Gyarados on their setup if teamed up with frog, which I do recommend.
Manectric
Make it your Mega and go for:
Manectric @ Manectite:
Trait: Intimidate
EVs: 252 SAtk / 252 Speed / 4 SDef
Modest Nature
- Volt Switch
- Thunder
- Hidden Power {
ICE
}
- Protect
Dragonite
Dragonite @ Assault Vest:
Trait: Multiscale
EVs: 252 HP / 252 SAtk / 4 Speed
Modest Nature
- Surf
- Draco Meteor
- Thunder
- Hurricane
This is a variant I wanted to test. I think it should work well. If not, you can be more classic.
Gyarados
Gyarados @ Leftovers:
Trait: Intimidate
EVs: 252 HP / 252 Atk / 4 Def
Impish Nature
- Waterfall
- Protect
- Toxic
- Rock Slide
I swear defensive Gyarados works well.
Ferrothorn
Just change the EVs to 252 HP / 172 Atk / 84 Def and you are fine.
I hope this helps!
~ Sincerely yours, Blitz.