Hi there, I'm fairly new to the competitive scene and was doing horribly or so until I decided to run a Sandstorm team which people were doing and so far my win percentage rate has increased. My last team was horrible, so after reading some articles and getting to know how to battle more effectively, this is what I've came up with, don't hold back on comments either, as the more I know and learn, the better I can become.
(Leftovers)
Sand Stream
Careful, 252 Hp, 252 Spd, 4 Def
Stealth Rock
Earthquake
Roar
Slack Off
I decided to Lead with a Tank Hippowdon in order to set up my stealth rock and Sand Storm. Taunt kinda cripples him so I switch into a different pokemon depending on what is against me, usually to my empoleon or forrestress, sometimes Garchomp. Roar and Slack Off are such great moves, whittling down my opponent and recovery at the same time is great.
(Leftovers)
Sturdy
Careful, 252 Hp, 252 Def, 4 Spd
Spikes
Toxic Spikes
Rapid Spin
Payback
Just your average Forretress, sets up spikes for me and can rapid spin opposing stealth rocks and spikes away, Payback is a fairly good move if forretress survives the hit, or when dealing with psychic types like renuniculus.
(Choice Scarf)
Sand Stream
Jolly, 4 Hp, 252 Atk, 252 Spd
Crunch
Stone Edge
Pursuit
Superpower
Copied this from Smogon tiers listings, he is a good physical beater and starts up Sandstorm. He's high speed means he usually hits first, however I'm still not sure if I should have Choice scarf on him due to his natural bulk and already high attack. Thoughts on this predicament?
(Lum Berry)
Sand Veil
Hasty, 4 Hp, 252 Atk, 252 Spd
Earthquake
Outrage
Sword Dance
Fire Fang
I made my Garchomp a physical sweeper for the tougher opponents I come against, if I know they're going to switch I usually use Swords Dance anyways, then hit them with Outrage next whatever pokemon comes in, then he usually sweeps 1-2 more, then Lum Berry cures his confusion at the end of it. Fire Fang is to cover Ice and Steel pokemon coming in to stop me.
(Petaya Berry)
Torrent
Modest, 12 Hp, 4 Def, 252 SpAtk, 240 Spd
Agility
Ice Beam
Surf
Substitute
Copied this set from Smogon archives as well, he is an amazing special sweeper and the use of substitute has saved my ass a few times. The berry is good when in a pinch, but I sometimes question Agility and wonder if including Aqua Jet as a priority move would be better. Thoughts?
(Choice Scarf)
Serene Grace
Jolly, 4 Hp, 252 Atk, 252 Spd
Iron Head
Trick
Ice Punch
U-Turn
Once again, copied this from smogon archives. I love Jirachi, he's my favorite pokemon and he's yellow, my favorite colour :) This choice scarf set is really good and has helped me out numerous times. Tricking off choice scarf is good as well, and Iron Head is a good way to try and score that free win every once and awhile.
All in all, I really like this team, but I'm free to hear any improvements or testing suggestions. Thanks for taking your time to go through all this.

Sand Stream
Careful, 252 Hp, 252 Spd, 4 Def
Stealth Rock
Earthquake
Roar
Slack Off
I decided to Lead with a Tank Hippowdon in order to set up my stealth rock and Sand Storm. Taunt kinda cripples him so I switch into a different pokemon depending on what is against me, usually to my empoleon or forrestress, sometimes Garchomp. Roar and Slack Off are such great moves, whittling down my opponent and recovery at the same time is great.

Sturdy
Careful, 252 Hp, 252 Def, 4 Spd
Spikes
Toxic Spikes
Rapid Spin
Payback
Just your average Forretress, sets up spikes for me and can rapid spin opposing stealth rocks and spikes away, Payback is a fairly good move if forretress survives the hit, or when dealing with psychic types like renuniculus.

Sand Stream
Jolly, 4 Hp, 252 Atk, 252 Spd
Crunch
Stone Edge
Pursuit
Superpower
Copied this from Smogon tiers listings, he is a good physical beater and starts up Sandstorm. He's high speed means he usually hits first, however I'm still not sure if I should have Choice scarf on him due to his natural bulk and already high attack. Thoughts on this predicament?

Sand Veil
Hasty, 4 Hp, 252 Atk, 252 Spd
Earthquake
Outrage
Sword Dance
Fire Fang
I made my Garchomp a physical sweeper for the tougher opponents I come against, if I know they're going to switch I usually use Swords Dance anyways, then hit them with Outrage next whatever pokemon comes in, then he usually sweeps 1-2 more, then Lum Berry cures his confusion at the end of it. Fire Fang is to cover Ice and Steel pokemon coming in to stop me.

Torrent
Modest, 12 Hp, 4 Def, 252 SpAtk, 240 Spd
Agility
Ice Beam
Surf
Substitute
Copied this set from Smogon archives as well, he is an amazing special sweeper and the use of substitute has saved my ass a few times. The berry is good when in a pinch, but I sometimes question Agility and wonder if including Aqua Jet as a priority move would be better. Thoughts?

Serene Grace
Jolly, 4 Hp, 252 Atk, 252 Spd
Iron Head
Trick
Ice Punch
U-Turn
Once again, copied this from smogon archives. I love Jirachi, he's my favorite pokemon and he's yellow, my favorite colour :) This choice scarf set is really good and has helped me out numerous times. Tricking off choice scarf is good as well, and Iron Head is a good way to try and score that free win every once and awhile.
All in all, I really like this team, but I'm free to hear any improvements or testing suggestions. Thanks for taking your time to go through all this.