ORAS OU Suggestions for my OU team

[ToonMagix]

This is my first time to the forums so...Hello

As the title says I need suggestions this team seems to be doing great since I made it but I would like some suggestions to make it better. For example, My team has no way of getting rid of entry hazards as of right now, but I really like this team it is my oldest of OU teams (I made others without suggestions but this team was made from reading Rotom W's suggestions under physically defensive.)
Also I just Kind of threw in Sylveon as I thought a medic would be a good idea. Especially since I can wish Landorus, Talonflame, and Lopunny back to health

Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
IVs: 0 Atk
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split

Landorus-Therian (M) @ Rocky Helmet
Ability: Intimidate
EVs: 248 HP / 244 Def / 8 SpD / 8 Spe
Impish Nature
- U-turn
- Stone Edge
- Earthquake
- Stealth Rock

Celebi @ Leftovers
Ability: Natural Cure
EVs: 252 Def / 4 SpA / 252 SpD
Modest Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Hidden Power [Fire]
- Psychic
- Giga Drain
- Nasty Plot

Lopunny-Mega (F) @ Lopunnite
Ability: Scrappy
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Fake Out
- Drain Punch (I never once landed a High Jump kick)
- Return
- Ice Punch

Talonflame (F) @ Choice Band
Ability: Gale Wings
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Brave Bird
- Flare Blitz
- U-turn
- Steel Wing

Sylveon (F) @ Leftovers
Ability: Pixilate
EVs: 248 HP / 244 Def / 16 SpD
Bold Nature
IVs: 0 Atk
- Hyper Voice
- Wish
- Heal Bell
- Protect

 

[IronBullet]

Hi, welcome to Smogon! I'll have to lock your RMT as the forum rules require that you provide in-depth descriptions for each Pokemon to explain their roles. Please read the rules carefully and take a look at Team Showcase to see the detail we require. PM me with updated descriptions and I'll be happy to unlock this.