[RATE MY TEAM] Looking for some input on my team!

[Sea34]

This is my first time experimenting with competitive team building and a 'Rain Dance' base team is my first test. I'm looking for people willing to give some tips on Pokemon, moves, and items to make sure I'm on the right track towards a winning team! Thank you!

For a Defensive beginner to set in Rain is:
[Pelipper]
Special Ability- Drizzle
Item- Damp Rock
Surf
Roost
Tailwind
U-Turn

[Heliolisk]
Special Ability- Dry Skin
Item-
Thunder
Focus Blast
Surf
Volt Switch

[Kingdra]
Special Ability- Swift Swim
Item-
Hydro Pump
Surf
Draco Meteor 
Dragon Pulse 

[Toxicroak]
Special Ability- Dry Skin 
Item- 
Earthquake 
Poison Jab
Dark Pulse 
Focus Blast 

[Goodra]
Special Ability- Hydration 
Item- 
Thunder
Raindance 
Earthquake 
Ice Beam

[Gardevoir Mega]
Special Ability-
Item- Gardevoirite
Rain Dance
Wish
Psychic
Dazzling Gleam