Alright, this is what I came up with for this team.
Kingdra
I removed Weather Ball for Protect, because without it this Kingdra isn't going to be lasting long, and I also removed Tera Dragon for Tera Steel, to further help keep Kingdra alive.
Ogerpon-Wellspring
Shifted the stats to standard set, making it stronger and faster while keeping the bulk needed to redirect.
Pelipper
No changes here, this set is good
Grimmsnarl
The Lagging Tail wasn't working well, so I got rid of it for Light Clay then added Reflect over Trick.
Sinistcha (Removed)
I do get why Sinistcha was here, but it wasn't working aswell as it needed to, so I switched to a Grass type that can more consistently help the team...
Rilaboom
Rilaboom like Sinistcha appreciates the Rain nullifying it's Fire weakness, it also gives you a way to completely shut something down for a turn, and an extra way to pivot.
Rilaboom @Assault Vest
Ability: Grassy Surge
Tera: Fire
EVs: HP: 252 / Atk: 252 / Sp.Def: 4
Adamant Nature
-Fake Out
-Wood Hammer
-Grassy Glide
-U-Turn
Fake Out shuts down a threat for a turn, Wood Hammer deals big damage, Grassy Glide gives you priority which you didn't have before, and U-turn let's you pivot out.
Kilowattrel
This Kilowattrel needs Protect, and 2 Tailwind users is overkill, so I gave it Protect instead of Tailwind. If you feel that change isn't doing you well, try getting rid of Electro Web instead.
Pokepaste: https://pokepast.es/53abc5389217eedb