Ok, well you know how I rate so I'll just get into this one. (Your EV's are a bit...messed up. You can only have 510 EV's on any pokemon and Sharpedo has more)
Typing: The typing is pretty good on this team as well. You have a x2 weakness to ice and also a x2 weakness to rock, but that's all.
Synergy: You have a pretty good overall mix of sweepers, tanks, walls and scouts, but you need to change some of the EV's. I'll get to that in the next section.
Movesets (Before I start I want to ask something, I'm assuming Spd means speed, but that looks like Special Defense. Generally Speed is abbreviated Spe)
Talonflame: I wouldn't bother with leftovers on this talonflame. I would give it a choice band, life orb or sky plate. Also I wouldn't bother with roost, again it doesn't have enough bulk. Maybe try tailwind instead.
Sharpedo: Pretty standard sweeper set, but still works great.
Landorus: Regular landorus isn't a scout as much as Lando-T. I wouldn't bother trying to run U-Turn on it. You can do one of two things instead. You can try rock polish or run the basic set. I would run rock polish on this team because you have zero moves that up your own stats. So it's moveset would end up like this:
Landorus @ Life Orb
Ability: Sheer Force
EVs: 8 Atk / 252 SpA / 248 Spe
Modest Nature
- Rock Polish
- Earth Power
- Psychic
- Focus Blast
Magnezone: The biggest thing magnezone can do is eliminate ferrothorn. Also switch HP Ice to HP Fire. It's ability should be magnet pull. You can give it one of three items depending on your set I would do an air balloon.
Sylveon: You like sylveon don't you ;) This is a pretty good sylveon set for cleric (the only sylveon set for cleric tbh)
Venusaur: No giga drain? No synthesis? These are two great moves on venusaur wall (thanks semp for telling me the difference). I would have these two moves, toxic and leech seed on a venusaur wall.
I hope this helps you with your team. If you have any questions please ask in the comments.