What should I change about this team? I rarely battle competitively so I dont know if this is good or not.

Blastoise @ Leftovers
Ability: Torrent
Shiny: Yes
EVs: 252 Def / 252 SDef / 4 Atk
Impish Nature
- Waterfall
- Earthquake
- Rapid Spin
- Roar

Tyranitar @ Focus Sash
Ability: Sand Stream
EVs: 252 Spd / 252 Atk / 4 Def
Jolly Nature
- Dragon Tail
- Stealth Rock
- Fire Punch
- Stone Edge

Alakazam @ Life Orb
Ability: Magic Guard
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Psychic
- Signal Beam
- Focus Blast
- Energy Ball

Cobalion @ Expert Belt
Ability: Justified
EVs: 252 Spd / 228 SAtk / 4 Atk
Naive Nature
- Superpower
- Volt Switch
- Hidden Power [Ice]
- Flash Cannon

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 SDef / 252 HP / 4 Def
Relaxed Nature
- Spikes
- Leech Seed
- Toxic
- Protect

Charizard-Mega-Y @ Charizardite Y
Ability: Drought
EVs: 252 SAtk / 252 Spd / 4 HP
Timid Nature
- Flamethrower
- Air Slash
- Quick Attack
- Solar Beam