Help me improve my Rain team (National dex)

Question

Hi I dont have much experience with making a team but this is my first team where I was able to win consecutively and climb up 1320(my personal best). The team is very fun to play with but the problem is that when I go against pokemon like Toxapex, Alomomola, or pokemon with Regenerator I always lose whenever its a Stall team or just a pivot. So I am writting this to seek help and How I can make it better. Any advice is helpful. THANKS!

1. Pelipper

Pelipper (F) @ Damp Rock
Ability: Drizzle
Shiny: Yes
Tera Type: Water
EVs: 234 HP / 238 Def / 36 SpD
Relaxed Nature
IVs: 0 Spe
- Weather Ball
- Hurricane
- Roost
- U-turn

Nothing special about Pelliper its just a normal Rain setter

2. Barraskewda

Barraskewda (F) @ Life Orb
Ability: Swift Swim
Shiny: Yes
Tera Type: Water
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Liquidation
- Aqua Jet
- Close Combat
- Psychic Fangs

Barraskewda is my Rain sweeper with its very high attack and speed stat it is able to outspeed most of pokemons and puts in a lot of damage.

3. Ferrothorn

Ferrothorn (F) @ Rocky Helmet
Ability: Iron Barbs
Tera Type: Grass
EVs: 252 HP / 126 Def / 130 SpD
Careful Nature
IVs: 0 Spe
- Leech Seed
- Gyro Ball
- Knock Off
- Stealth Rock

I read from multiple place that in a Rain team Ferrothorn is a good choice to put in since its a very good pokemon and with the Rain up fire type moves are weakened allowing it to survive a hit

4.Greninja

Greninja (M) @ Expert Belt / Loaded dice
Ability: Battle Bond
Tera Type: Water
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Dark Pulse
- Water Shuriken
- Ice Beam
- Sludge Wave

Now you might think why is Greninja in a Rain team. Simply just because its my favorite pokemon. When I was first building this team people told me it would be easier to build a team if you choose a pokemon I wanted to use first and start from there and my choice was Greninja. Greninja's role is to pick up kills and get the Battle Bond boost and try to sweep or put in damage much as possible. The reason I use Water Shuriken instead of Hydro pump is that First, it has low accuracy(80%). Second, Water Shuriken is a priority move making it go first and sometimes when Raging bolt comes in I just use Water Shuriken to chip much I can and also Water Shuriken goes first so thunder clap fails.

5. Zapdos

Zapdos @ Heavy-Duty Boots
Ability: Static
Shiny: Yes
Tera Type: Electric
EVs: 240 HP / 8 Def / 16 SpA / 228 SpD / 16 Spe
Calm Nature
IVs: 0 Atk
- Volt Switch
- Hurricane
- Thunder
- Heat Wave

My Zapdos is different then the most Zapdos. Most Zapdos runs the Defensive build. Which is good but I lack Special Defensive pokemon in this team so I decide to rock with Special Defensive Zapdos which helped me a lot to take hits from Special move using Pokemons. I also have the move Heat wave so I at least a move to take down foe's Ferrothorn

6. Garchmp

Garchomp (M) @ Loaded Dice
Ability: Rough Skin
Shiny: Yes
Tera Type: Dragon
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Scale Shot
- Earthquake
- Iron Head

My last pokemon is Garchomp. He's here to nullify electric type moves and also when I dont have weather control or Rain is down I use him to sweep the opponent's Pokemons using Swords dance to boost Garchomp's attack and Scale shot to raise is speed.

Comments

Not a full answer, but there's some things I'm noticing.
Zapdos usually likes to punish physical attackers with Static, using it as a specially defensive mon loses some of its potential. I would recommend AV Torn-t over Zapdos (personal bias, I like using torn) as a specially defensive flying type, but if you do want to keep Zapdos for a way of dealing with Alomo reliably I suggest Defog and Roost over Volt Switch/Thunder and Heat Wave. Heat Wave doesn't work well with rain: you even mentioned it yourself on Ferrothorn being able to maybe survive a fire move in the rain. This is also another reason why I recommended Torn-t as it gets Focus Blast (it also does have Heat Wave in case you for whatever reason really want to use the move) to hit Ferrothorn, granted that it's called Focus Miss for a reason. Alternatively, you could replace Heat Wave with Roost and keep the other three moves, and give Pelipper Defog. I emphasize Defog because Pelipper gets heavily chipped by it and most of your team don't appreciate the chip either.
Instead of Garchomp, Mega Swampert synergizes better with your team, as it provides an electric immunity and also benefits greatly from rain with Swift Swim. If you're looking for a dragon type, Walking Wake also works on the team, as it can take advantage of the rain but more importantly helps the team deal with sun teams if Pelipper is taken down. (EDIT: NVM, Wake is banned)
I like Flip Turn on Barraskewda more than Aqua Jet, as that thing goes at mach speeds under rain, so revenge killing isn't usually it's best role. It's definitely an option, but I prefer Flip Turn to get out of a bad matchup. (EDIT: Replace Psychic Fangs, it's unnecessary coverage)
Pelipper's role is to set up rain and be a tanky mon, so to annoy physical attackers I'd say to replace Weather Ball with Scald, but that's up to you to decide if you value the damage or the 30% burn chance.
What is the purpose of Sludge Wave on Gren? I guess it covers for fairies but under the rain a STAB Surf actually hits harder than supereffective Sludge Wave, which is what I suggest replacing it with.
I believe that the reason for your losses against defensive Pokemon is that you only have one setup sweeper currently in Garchomp. You need more stallbreakers to break through Pokemon like Alomo, Slowbro, and Water Absorb Clodsire. A reliable Freeze Dry user also decimates most of your things, so that's something to keep in mind as well.

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couple things:
1. tornt can work, but that basically requires raging bolt to deal with bulky waters
2. walking wake is banned.
3. barraskewda usually runs all of aqua jet, flip turn, liquidation, and close combat. psychic fangs doesnt hit much that mega swampert or just pure liqui spam can't deal with
4. gren is a really unconventional pick on rain to begin with, but poison coverage hits nearly nothing in this meta; the only fairies are all tapus except bulu, iron valiant, hatterene, and maybe clefable; all get cooked by water and ice moves. typically, you would want the power of hydro pump.

more in depth analysis later (give me like a week i have things to deal with)

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yeah what he said