Help to swap pokemons on this team for OU

Question

Some time ago i found this team featuring many pokemons i like, but now with Lucario-mega being Uber, i dont know how to change it. Is going to need to change a lot of its composition? what must replace Lucario? And finally, what changes can be made to make it trully stable?

Lucario-Mega @ Lucarionite
Ability: Adaptability
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Bullet Punch
- Swords Dance
- Close Combat
- Meteor Mash

Toxapex @ Black Sludge
Ability: Regenerator
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Toxic Spikes
- Recover
- Scald
- Haze

Garchomp @ Rockium Z
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Earthquake
- Fire Blast
- Stone Edge
- Stealth Rock

Togekiss @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 252 SpD / 4 Def
Calm Nature
- Thunder Wave
- Heal Bell
- Air Slash
- Roost

Roserade @ Life Orb
Ability: Technician
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Leaf Storm
- Spikes
- Sludge Bomb
- Hidden Power Fire

Eelektross @ Assault Vest
Ability: Levitate
EVs: 252 HP / 252 SpA / 4 Atk
Rash Nature
- Flamethrower
- U-turn
- Thunderbolt
- Giga Drain

Thanks in advance for any help

Comments

This will probably help more than a team rate. https://docs.google.com/document/d/1qYztMbBTY0qm4mFy1-66bafgsVQ2gkeErAO3QUghEBY/edit?usp=sharing

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im mostly looking for advices to switch Mega Lucario, THEN minor tweaks for the team, i'm pretty new on the game (for US i only had non competitive emerald as experience) and im sure there are many things im unaware of, like pokemon equivalents and their unique different strengths.

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I think the problem is that you need more than a few minor tweaks. Why are you using Togekiss, Roserade, and Eelektross when you could use Tornadus, Kartana, and Rotom instead? (also you should replace Lucario with Lopunny)

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Oh! These pokemons are a few i found and liked, no particular reason (excep if you count the fact that i had to ask "Who?" When i read the other names, did i mention that im almost new in this whole series?) Soooo if you suggest Lucario-Lopunny, Tornadus-Roserade, Kartana-Eelektross and rotom...wash?-Togekiss i can try to figure out a move pool for them but oh boy is gonna take me time, Thanks btw.