Rate my first OU team?

Question

Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 4 HP / 252 Defense / 252 Speed
Impish Nature
-Earthquake
-Toxic
-Substitute
-Protect

Gyarados @ Gyaradosite
Ability: Intimidate
EVs: 252 HP / 252 Attack / 4 Sp. Def
Adamant Nature
-Rest
-Sleep Talk
-Dragon Tail
-Waterfall

Alakazam @ Life Orb
Ability: Magic Guard
EVs: 252 Sp. Att / 252 Speed / 4 Sp. Def
Timid Nature
-Psychic
-Shadow Ball
-Focus Blast
-Recover

Tyranitar @ Tyranitarite
Ability: Unnerve
EVs: 252 Att / 252 Speed / 4 Sp. Def
Adamant Nature
-Rock Slide
-Taunt
-Dragon Dance
-Earthquake

Sylveon @ Leftovers
Ability: Pixilate
EVs: 252 HP / 252 Sp. Def / 4 Sp. Att
Calm Nature
-Heal Bell
-Wish
-Protect
-Hyper Voice

Gengar @ Leftovers
Ability: Levitate
EVs: 252 HP / 252 Speed / Sp. Att
Timid Nature
-Destiny Bond
-Shadow Ball
-Substitute
-Disable

This is my first ever competitive team so please help me the best you can. Thank you.

Comments

Two mega pokemon is not a great idea in singles, I would say give Leftovers to Gyarados and Black Sludge on Gengar.

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remove waterfall and add surf to gyarados

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^ That's a pretty bad suggestion, considering Gyarados has better attack than sp. attack and a good boosting move (Dragon Dance).

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D Dance with rest and Chesto berry would also work well. Replace intimidate with Moxie as it helps you sweep better. Earthquake is also good for dealing with electric types.

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Replace your Gyarados's dragon tail for a better dragon type move.

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Then suggest a Dragon move that works better on this particular set? Dragon Tail is there primarily to force switches on people, not for type coverage or dealing damage.

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I'd say Outrage - for its sheer power ( besides Dragon Tail, Outrage is the only physical Dragon move Gyarados has access to ). Since your gyarados is mega, why not replace DT with Crunch as it gives STAB ?

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You're missing the point. His Gyarados is not an offensive one. It's not the one that brings down through brute force. This one's meant to stall out the opponent and last on the field. Hence, in lieu of offensive moves, a phazing move like Dragon Tail is preferred.

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Yeah...sorry bout that. It's just that his Gyarados is mega and the defensive variant prefers the non- Mega with leftovers. In that case, the EVs on Atk should be moved to Def and S.Def .