Hey cool team dude, congrats on 1,000 posts!
My first suggestion is an easy one,
change Venusaur's nature to Timid. While a + Spe nature on a chlorophyll Pokemon at first seems like a waste, I'll tell you why its almost a necessity. Choice Scarf 110s outspeed Modest Venusaur, even in the Sun;
Choice Scarf Latios is actually gained a lot more usage and will stop your sweeper in its place. Timid is an easy fix to this and at +2 Venusaur easily OHKOs with Sludge Bomb.
My second suggestion is to change up your Ninetales spread. At the moment
Calm Mind Latias can take advantage on many of your Pokemon to set up and you don't really have any Pokemon who want to take it on, because of this I recommend changing your
Ninetales to a more Specially Defensive Spread. The set I suggest is:
...
Ninetales (F) @ Leftovers
Trait: Drought
EVs: 248 HP / 160 SDef / 100 Spd
Timid Nature (+Spd, -Atk)
- Will-O-Wisp
- Flamethrower
- Sunny Day
- Roar
One of Ninetales only niches, besides Drought of course :), is as a surprisely bulky special defensive phazer. Ninetales doesn't really mind CM Latias and will be able to roar it out for most of the game, until you're in a better situation to deal with it. This set allows Ninetales to take the Dragon Pulses or HP Fires Latias will throw, while also being able to switch into Bulky Politoeds Scalds. You keep Sunny Day and Will-O-Wisp to deter other Weather starters as well as having more overall utility.
An interesting little change I've thought about is
replacing Toxic on Forretress for Earthquake. Your team really doesn't like
Heatran. Landorus-T helps you in some regard, but an Offensive Heatran will have no problems tearing through it and Landorus-T can't even switch in. On the other hand your best switch-in, Latias, can't really dent Heatran too much if in the Sun as Surf is nerfed. Heatran
loves switching in on Forretress, usually its about as free a switch as you'll find. But thats where the
gimmickiness comes in, smacking a Heatran with Earthquake on the switch in will do a lot for removing it completely for your team. Granted this is definitely a gimmick, and while they can help, they can't be relied on completely.
I'm not terribly sure what the merits are of Specially Defensive Landorus-T and would love to hear your thoughts on them. I want to recommend something else for that slot that better deals with Heatran but I want to know more about the Pokemon before slating to replace it.
Good Luck!