Hi there.
It is an very interesting offensive team, I appreciate a lot your team, but I see a weakness against Rotom-W you have nothing for tank his Volt Switch , because Landorus is OHKO by Hydropump , and Scizor can take a Will-O-Wisp then your Rotom-W can not tank easily Volt Switch, then I see that you are very disadvantaged against Sun Teams, you have nothing to come on Venusaur without problem; Scizor is OHKO by Hidden Power Fire and under Sun Tornadus can miss Hurricane and then it 2HKO by Sludge Bomb/Hidden Power Ice, I suggest you to Latias LO on Landorus, Latias LO is a very good pokemon for your team, it can come easily to Rotom-W, and it is also a very good counter against the Sun because it tank Venusaur and Ninetales and then Latias has the Recover move to heal.Then I suggest you Sleep Talk on Substitute for Tornadus-T because you are very disadvantaged against Breloom, Breloom has Spore and he can asleep Tornadus-T to kill, now you can come on Breloom easily and kill him with Sleep Talk.
Tl;dr
Hope i Helped and Good Luck with your team.