[HMF] First OU Team - balanced

Hello. I've looked into competitive pokemon a little bit and read up on the basics, but am still very new and would love input on my first OU team. The goal was to have a fairly even spread of threats that punish people who allow me to set up a bit.

Azelf @ Focus Sash Ability: Levitate Shiny: Yes EVs: 4 HP / 252 SpA / 252 Spe Naive Nature - Stealth Rock - Taunt - Fire Blast - Explosion

Magearna @ Leftovers Ability: Soul-Heart EVs: 4 Def / 252 SpA / 252 Spe Timid Nature IVs: 0 Atk - Shift Gear - Ice Beam - Thunderbolt - Calm Mind

Lopunny-Mega @ Lopunnite Ability: Limber Shiny: Yes EVs: 252 Atk / 4 SpD / 252 Spe Jolly Nature - Return - High Jump Kick - Power-Up Punch - Fake Out

Heatran @ Leftovers Ability: Flash Fire EVs: 248 HP / 252 SpA / 8 Spe Calm Nature IVs: 0 Atk - Lava Plume - Stealth Rock - Protect - Will-O-Wisp

Salamence @ Flyinium Z Ability: Moxie EVs: 252 Atk / 4 Def / 252 Spe Jolly Nature - Dragon Dance - Fly - Dragon Claw - Earthquake

Suicune @ Leftovers Ability: Pressure Shiny: Yes EVs: 252 HP / 16 SpD / 240 Spe Timid Nature IVs: 0 Atk - Scald - Substitute - Calm Mind - Protect

Azelf is pretty much my go to lead. If they lead with someone who looks like a setter then I can punish with taunt into stealth rock. If I'm full after that then I can go fireblast into explosion or just explosion to try to set up a sweeper. Fireblast also OHKO's fero, which is super nice.

Magearna and suicune are my bulkier sweepers. They often take over games by just powering up and I've been fairly happy with how they are performing. I've also been super happy with salamence. Getting a dragon dance into a flynium z really gets the ball rolling and often takes out the pokemon thats sent in to counter.

The main 2 pokemon I'm not entirely sure about are lopunny and heatran. Lopunny's just a solid physical sweeper. Fake out is there for focus slash users and such. Free damage is always nice. It used to be encore but I found myself never using it. Punch helps break down sweepers and the others are just solid stab moves.

Heatran's moveset feels weird to me. He feels like a stall/burn pokemon with stealth rocks in case azelf's have been removed and he's already blown himself up, but it never feels to be performing as well as I feel like it should.

Any suggestions and tips would be very welcome. Thanks for the help!