SL Sunday: Mega Ampharos (IMPORTANT EDIT)

Hello everyone!  It is Steak again.  This week we will be looking into a team that I made based around Mega Ampharos.  This team is following the four OU limit and the no legends rule.  Below, there is a poll on whether I should keep the no legends rule or not due to the event distributions happening later this year.  I have never seen anyone use Mega Ampharos, so I thought I should try it out.  Anyways, to the team:

Ampharos-Mega @ Ampharosite  
Ability: Static  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
- Agility  
- Thunderbolt  
- Dragon Pulse  
- Focus Blast  

Scizor @ Life Orb  
Ability: Technician  
EVs: 252 HP / 252 Atk / 4 SpD  
Adamant Nature  
- Bullet Punch  
- Bug Bite  
- Swords Dance  
- Defog (EDIT: I switched out Defog for Roost.) 

Klefki @ Focus Sash  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 4 SpD  
Adamant Nature  
- Reflect  
- Light Screen  
- Play Rough  
- Last Resort  

Vaporeon @ Leftovers  
Ability: Water Absorb  
EVs: 4 HP / 252 Def / 252 SpD  
Bold Nature  
- Wish  
- Heal Bell  
- Scald  
- Protect  

Gliscor @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Taunt  
- Toxic  
- Roost  
- Knock Off  

Volcarona @ Passho Berry  
Ability: Flame Body  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
- Quiver Dance  
- Fiery Dance  
- Giga Drain  
- Bug Buzz  

I tried to make this team as viable as I could.  Advice on the biggest weaknesses the team has and ways I could fix it would be much appreciated.  Please leave suggestions that aren't on the schedule below.

SL Sundays Schedule:

January 24th: Mega Absol (This week's SL Sunday has been canceled. I will be back on next week.)
January 31st: Mega Beedrill
February 7th: Mega Pidgeot
February 14th: Mega Venusaur
February 21st: Mega Charizard
February 28th: Mega Blastoise

I don't know if last resort is that usefull on Klefki. You need to use all the moves before using it. Maybe switch it out for..... now that I see it's moveset it has no other good physical attacks. You could use a status move like thunder wave to paralyze some mons to let your Ampharos and Scizor sweep more easily.

Roost on Gliscor is usefull, but I prefer protect. You get an extra turn to heal, extra toxic damage and you scout what the opponent might do next.

Your team also lacks any entry hazards. While that isn't necessary it is useful. If you don't have entry hazards your opponent can switch freely into any pokémon to handle yours. While if you use some your opponent doesn't gain that advantage infinitely.