Rate My National Dex AG Team

Question

Eater (Eternatus) @ Black Sludge
Ability: Pressure
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Recover
- Dynamax Cannon
- Toxic Spikes
- Shadow Ball

Blub Gub (Blastoise-Mega) @ Blastoisinite
Ability: Torrent
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
- Rapid Spin
- Scald
- Dark Pulse
- Aura Sphere

Kapu-Koko (Tapu Koko) @ Tapunium Z
Ability: Electric Surge
Shiny: Yes
EVs: 248 HP / 8 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Nature's Madness
- Discharge
- Toxic
- Roost

DOGO (Dialga) @ Adamant Orb
Ability: Pressure
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Flash Cannon
- Draco Meteor
- Roar
- Thunder Wave

Little one (Aron) @ Heavy-Duty Boots
Ability: Sturdy
Level: 1
Shiny: Yes
EVs: 36 Spe
Bold Nature
IVs: 0 Atk
- Endeavor
- Ancient Power
- Autotomize
- Body Press

Tree (Chesnaught) @ Sitrus Berry
Ability: Bulletproof
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Leech Seed
- Belly Drum
- Drain Punch
- Substitute

Thank You and Please tell me better options!

Comments

Your team needs a lot of work. Eternatus is the only viable mon here, and that set needs to be improved. Why use stuff like Mega-Blastoise, Chestnaught, and Aron when Primal-Kyogre, Primal-Groudon, Arceus, Zacian-Crowned, Necrozma Duskmane, Yveltal, Xerneas, and God-erm-Mega Rayquaza exist?

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You should probaly know i can use leech seed then swithc to aron and stay up with sturdy then use endeavor then absorb and finsh the foe with leech seed effect

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-Eternatus is a good Pokémon, but your set needs improvement
-Mega Blastoise is outclassed as a water type by Waterceus, Kyogre, and Primal Kyogre
-Tapu Koko is outclassed by Arceus-Fairy for the utility it looks like you’re going for
-Your Dialga set confuses me…..NDM is a better choice
-Aron is an unviable gimmick, and Chesnaught is unviable as a whole.

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Overall this seems to be a decent team, but I think your poison defense is very weak. I would suggest adding a psychic type on to your team, maybe replacing your Chesnaught with a Celebi or your Tapu-Koko with Tapu Lele or something like that. Or maybe you could replace aron (Because you already have a steel type, Diagla) with a more viable legendary (or just use aron as your replacement for a psychic) like Primal Kyogre, Primal Groudon, Mega Rayquaza, Zacian/Zamazenta, etc.
Then again, I'm really not one to judge your competitive team, as my team is basically guardevoir, alakazam, mewtwo and some random other psychic pokemon XD