Virizion is a very good pokemon especially when the obvious switch in to Breloom is either Celebi or D-Nite. The problem is losing spore and effecting the balance of special to physical attackers on the team. That can be compensated by switching another special pokemon for a physical variant but again Skarmory is something I tend to make most of my team being able to handle or at least, for Breloom, to put to sleep.
It's a matter of choice really, but its a good one nevertheless.
Hey Hasoonie, I broke into the 1500s finally! I'm glad you guys enjoyed it, hopefully this would prove the HO teams are viable and fun to play with. Explaining t-bolt on Latios I'm aiming to equip him with all the tools he needs to manhandle everyone he faces. But in my recent experiences I see too many Heatrans running into him and as you can figure out, t-bolt does measly damage. So yeah I think Surf is a good suggestion.
I'm taking a break from this team for a while to make a new one, because I feel I'm worn out, I've playing a variant of this team since June so change is good but do please feel free to add any new changes, this team is public property after all :)