Suggestions for my new team?

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I've been inactive on here & Showdown recently because school has started up again, and I've started to get back into battling. Here's a team I've been screwing around on Showdown with. It's not perfect, but I've gotten a couple of wins with it. Suggestions are welcome! It's basically a mix of the teams I've posted here already, with Thundurus added.

Thundurus @ Sitrus Berry

Ability: Prankster
Level: 50
EVs: 244 HP / 108 Def / 64 SpA / 72 SpD / 20 Spe
Calm Nature
IVs: 0 Atk
- Thunder Wave
- Thunderbolt
- Swagger
- Taunt

Bisharp (M) @ Focus Sash
Ability: Defiant
Level: 50
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Knock Off
- Sucker Punch
- Iron Head
- Protect

Fishy (Milotic) (M) @ Wacan Berry
Ability: Competitive
Level: 50
Shiny: Yes
EVs: 252 HP / 248 Def / 4 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Scald
- Ice Beam
- Protect
- Recover

Sylveon (F) @ Choice Specs
Ability: Pixilate
Level: 50
EVs: 92 HP / 116 Def / 252 SpA / 48 SpD
Quiet Nature
IVs: 0 Atk
- Hyper Voice
- Psyshock
- Return
- Shadow Ball

Aegislash @ Leftovers
Ability: Stance Change
Level: 50
EVs: 252 HP / 4 Def / 176 SpA / 76 SpD
Modest Nature
IVs: 0 Atk
- King’s Shield
- Shadow Ball
- Iron Head
- Wide Guard

Dragon Tales (Salamence) (F) @ Salamencite
Ability: Intimidate
Level: 50
EVs: 6 Def / 126 SpA / 126 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hyper Voice
- Dragon Pulse
- Roost
- Fire Blast