I'll list a few key things:
Firstly, Tailwind will be ubiquitous in this format, as the team lacks a lot of speed control. Although it may not be too important, the only pokemon that is fast here is actually Dragapult. Rillaboom has mediocre speed, and will not pick up on many OHKOs since it holds Terrain extender. If you want Rillaboom to pick up fast KOs, choice band is much more recommended. However, I understand how you want to use Rillaboom to set up sap sipper for Goodra.
On that note, sap sipper Goodra may not be the optimal gimmick for this series. Each grassy glide into Goodra = x1.5 attack boost, only raising Goodra's from 105 to 157.5 - which is pretty horrendous to say at the least.
Additionally, most of your sets contradict one another. I'll start off by pointing out Brick Break isn't a common choice on Tyranitar, but I can still understand some of your fear of screens. What is slightly bizarre, is its 100 investment in spA. If you're not using any special moves, that investment in special attack is completely wasted. Plus, lax is going to drop Tyranitar's sp.def, allowing it to be within OHKO range from Tapus.
If you want to run Venusaur, then you MUST run Torkoal alongside it. Without the sun, Venusaur falls victim to numerous threats and can easily become an OHKO or 2HKO, especially with the dynamax factor being everywhere nowadays. If you want to put mons to sleep, use Amoongus or Butterfree, but definitely not Venusaur without Torkoal. Additionally, do you have any calcs as to why you used those spreads? As far as I am aware, it doesn't change that much at all, alongside its peculiar IVs.
Sap Sipper Goodra should typically be used as a physical mon - not special. Great - you have +6 attack from using grassy glide and sleep powder from Rillaboom and Venusaur respective. However, not a single one of your moves are physical - you're essentially wasting turns for no gain! Please consider using another Sap Sipper mon such as Azumarill if you extremely think it's crucial, but otherwise, the logic in Goodra is slightly bizarre. Once again, please include calcs for your spreads please!
Justified Arcanine has become a bit more common recently. However, I can assure you that Terrakion is a MUCH better. They bolster a higher attack stat, speed and better bulk. There is absolutely no reason for you to use arcanine unless you seriously want a fire coverage mon. Plus, why use heat wave on a physical Arcanine? Consider using flare blitz instead. Additionally, bulldoze is almost useless, and should be replaced with the coverage moves Arcanine is provided with - play rough or wild charge. Arcanine is supposed to be offensive in this team and thus, you should try make it as menacing as possible.
Finally, Dragapult typically holds a sash due to its poor bulk and bad typing. I understand the gimmick you want to run, but Dragapult doesn't even have beat up! Thus, it can't even set up justified! I'll also mention that Breaking Swipe isn't optimal, and that U-Turn or Will-o-wisp is a much better pick.
Please provide some reasoning for your spreads, and consider allowing your pokemon to work in synergy. There are numerous gimmicks you want to run, but Special Goodra with Sap Sipper and 2 Grass type mons to activate it just doesn't make sense - either you run different mons or make Goodra physical, which I wouldn't seriously advocate. Dragapult doesn't have beat up, but I think that may be just a mistake, but Arcanine should be equipped with Flare Blitz, Wild Charge, Play Rough and Iron Head (maybe protect if you want). The spreads are a little strange, so please provide some reasoning too!
I'll just say that the team contradicts each other. You have investment in special attack, but the pokemon is clearly a physical attacker and doesn't even have any special moves (Tyranitar).
Please consider doing a bit more research and reading some teambuilding guides, because it seems as though teambuilding is a little bit new to you. Keep in mind that physical attackers should have physical attack EVs, special attackers should have special attack EVs, and that you should provide calcs if you want to invest in bulk in order to show the people on this community justification to your spreads.
I hope you learned some things, and feel free to ask questions!
