>>48078705>Venusaur has to choose between sleep powdering staraptor or garchomp;It's not much of a choice. Staraptor hits much harder and is faster than Charizard if it's scarfed (which just about all of them are). Charizard can meanwhile can protect for one turn to be able to survive and then punt Chomp into the sun. Even if it doesn't protect, the sleep powder will ensure that Staraptor can't attack. If Charizard-Y uses Heat Wave, it has a near 90% chance to OHKO Staraptor (and that's only because of doubles reduction; it'd flat out OHKO in singles) and gets chip damage on Garchomp.
Mega Garchomp is also unable to one-hit-kill Venusaur on the first turn, preventing this gang-up from being stopped. Even with a critical hit, Stone Edge will only 2HKO, and Earthquake in Doubles hits much less hard. The only way Garchomp is able to OHKO Venusaur on the first turn is by clicking Outrage, and even then it requires a roll as it has a chance to only 2HKO. And Outrage is not the most reliable move in doubles: you have to keep in mind you cannot select a target when you use Outrage because the move targets the user; after that the game randomly selects an enemy to attack.
It's just not a fight that the two are going to win, unless they get extremely lucky. Of course, running specific items to counter-team people as if you had foresight knowledge such as going safety goggles just for one match to mess with Venusaur, but if that's the case it not only has to coinflip to see if it wins against Charizard but if we're going to say we can run specific items to beat opponents Venusaur can just grab Poisonium Z and flat out one-hit-kill the Bird before it even gets to move.
All of these calculations have been with intent of having teams that are built as you'd normally build a doubles core: the idea that each team is equipped with the sets to give them the best fighting chance against as many opponents as possible. The Sun Team just beats Chomp. Not much too it.