Welcome to Gaia! ::

Ok if you're shooting for a Sandstorm team then you want your lead to be Hippowdon. Since it's ability is Sand Stream, it whips up a sandstorm without having to use up a move slot which can be used for other helpful moves. I'd also say lose the Encore and Spikes on Cacturn and replace it with Substitute and Swords dance.

Your second team should do much better than your first.

Metagross: Lose Iron head and Zen head butt. Replace them both with Earthquake and Bullet punch.

Flygon: Keep it's moves but for the last slot put in either Fire Blast/Stone Edge/ or U-Turn.

Tyranitar: I see you're running the Mixtar setup. Tyranitar can do well with special attacks with a base Sp. Att of 95. But its base 134 attack makes it more versatile as a physical attacker. I'd suggest using : Crunch, Dragon Dance, Stone Edge, and Fire Punch. And for EVs go with 252 att 252 speed and 4 hp.

Breloom: Lose Facade and give it Substitute.

Yep as he said about the Breloom Substitute is a much better move than Facade.
Start off with a Spore, then substitute and your toxic orb will heal you to max anyway, then Focus punch them to death, since they cant break your hit while they are asleep and they cant break it if they for some reason woke up and hit your sub. 3nodding
Its basically a win/win situation. Only issue I see is being outrun and beat in 1 shot. Or they switch out the sleeping Pokemon, while the Sleep Clause is on. sweatdrop