Alright, so I'm fairly new to singles I've only been playing for a few months but I've been in the VGC metagame for about 4 years. So here is my first singles team and I would really like so help so here it is:
Politoed (Y U NO?!)- calm
252HP/ 120Def/ 16Sp.Atk/ 120Sp.Def @Lefties
Ability: Drizzle
Protect
Toxic
Scald
Ice Beam
Your "standard" Politoed moveset. Scald for Burn, Ice Beam for dragons and other flying types. Toxic is there to poision other water types like Gastrodon and Politoed. Protect is for scouting as well as toxic stalling when needed.
Gliscore ( StallBat )-Impish
194HP/ 236Def/ 80 Speed @Toxic Orb
Ability: Poison Heal
Substitute
Baton Pass
Ice Fang
Earthquake
This Gliscore is not a normal stall set. Its accually ment to pass subs off to other team mates. This works really well with my DD Gyrados. Baton Pass can also work like a "soft switch" allowing me to sometimes get the switch advantage into what ever my opponet "hard switches" into. EQ for STAB as well as hitting like Ferrothorn and Terrakions. I use to have Stealth Rocks on this thing, but I took them off for Ice Fang because I would get into situations where this would be my last poke and the other guys would be immune to EQ. Its aso helpfull for hitting other dragons and Flying Types.
Gyarados ( RAGE QUIT )-Jolly
6HP/ 252Attack/ 252Speed @Lum Berry
Ability- Moxie
Dragon Dance
Waterfall
Earthquake
Stone Edge
When this thing starts. It dose NOT stop. The reason I chose Jolly over Adamant is because after +1 on Speed this thing is set to out pace everything in the meta game baring scarfed pokes. Also, if Moxie is going to continuously rack up theres no point in adamant because the moxie will compensate. This is normally a late game sweeper to bring it all home. The idea is set up a sub with Gliscore and Baton Pass it to this monster and set up a free DD and then just proceed to sweep teams. The Lum Berry is there incase Gliscore isnt there to set up a Sub, this way incase anything trys to status Gyrados it will be all set to sweep regardless. Waterfall for STAB and a rain boost will hit very hard to anything that doesn't resist it, EQ is for Ferrothorns and anything that resists Waterfall, and Stone Edge is there for Flying types ( mainly the dragons that resist both EQ and Waterfall ).
Tentacruel ( Harpoon )- Bold
252HP/ 240Def/ 16Speed @Black Sludge
Ability- Rain Dish
Protect
Toxic Spikes
Rapid Spin
Scald
The teams Rapid Spinner and Toxic supporter. I use to use Vaporeon, but then when I saw a Stealth Rocks problem I knew Tentacruel was soon going to replace Vaporeon. I decided that its good Sp.Def stats wouldn't need much of an invesment so I ran it bold to bulk it up a bit, Anyways the set is pretty stright forward: Set up T-Spikes, Rapid Spin Rocks away. Protect is for scouting/ recovering a bit. I chose Black Sludge because I wanted to punish Trickers a bit. So if they tick my Tentacruel, they will lose HP everyturn which can really rack up after Toxic dammage and Black Sludge.
Jolteon ( Drive By )- Modest
6HP/ 252 Sp.Attack/ 252 Speed @ Choice Specs
Ability: Volt Absorb
Volt Switch
Thunder
HP-Ice
Shadow Ball
I must say, the moment I found out this thing has base 525 Sp.Attack w/ Specs, I just wanted to abuse this thing so much. Jolt normally leads unless there are ground types then its normally Gliscore. The plan is to Volt Switch the first turn then wait till rain is set up and proceed to abosolutly run wild with Thunder. This thing also make a very solid Check to Thunderous- T. HP-Ice is able to OHKO after rocks dammage. With this things base speed of 130, Jolt is able to out pace every poke in the meta game baring Timid Tornadus-T, and its also able to out pace so scarfers as well. Shadow Ball is kinda a filler move and it works well w/ Deoxys-D leads able to 2HKO it. It also works as a "safe move" for when there is a ground type still lingering on the opponets team. This thing can also absorb some of the Electical attacks aimed at my Poiltoed, Tentacrule, or even Gyarados.
Celebi (Trollerbi)- Modest
108HP/ 200Sp.Atk/ 200Speed @Lefties
Ability: Natural Cure
Thunder Wave
Stealth Rocks
Giga Drain
HP-Fighting
I had alot of things in this last slot: Breloom, Alakazam, but none of them worked out very well. I also saw over time that rock support was really needed for my Jolteon and Gyarados to get the KOs they needed. What made me choose Celebi is the fact that I saw that when my Jolteon whent down I really struggled with other rain teams and it would turn into a stall fest and blah blah blah. STALL. So! I brought in Celebi. It gives both rock support and T-Wave, which is really useful for catching things on the switch like Tornadus-T, Terrakion, to name a few. Giga Drain is for STAB as well as helping Celebi live a little bit longer. Hp-Fighting is used mostly for Ferrothorns which can really check this team unless my Gyarados has like +3 or something. But HP-Fighting is about a 3HKO and Celebi almost always forces Ferrothorns to switch after they set up hazzards.
So that's the team. If you have any futher questions about them please feel free to ask. Again, I've only been playing singles for a few months so any kind of help would be great. Thanks!

Politoed (Y U NO?!)- calm
252HP/ 120Def/ 16Sp.Atk/ 120Sp.Def @Lefties
Ability: Drizzle
Protect
Toxic
Scald
Ice Beam
Your "standard" Politoed moveset. Scald for Burn, Ice Beam for dragons and other flying types. Toxic is there to poision other water types like Gastrodon and Politoed. Protect is for scouting as well as toxic stalling when needed.

Gliscore ( StallBat )-Impish
194HP/ 236Def/ 80 Speed @Toxic Orb
Ability: Poison Heal
Substitute
Baton Pass
Ice Fang
Earthquake
This Gliscore is not a normal stall set. Its accually ment to pass subs off to other team mates. This works really well with my DD Gyrados. Baton Pass can also work like a "soft switch" allowing me to sometimes get the switch advantage into what ever my opponet "hard switches" into. EQ for STAB as well as hitting like Ferrothorn and Terrakions. I use to have Stealth Rocks on this thing, but I took them off for Ice Fang because I would get into situations where this would be my last poke and the other guys would be immune to EQ. Its aso helpfull for hitting other dragons and Flying Types.
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Gyarados ( RAGE QUIT )-Jolly
6HP/ 252Attack/ 252Speed @Lum Berry
Ability- Moxie
Dragon Dance
Waterfall
Earthquake
Stone Edge
When this thing starts. It dose NOT stop. The reason I chose Jolly over Adamant is because after +1 on Speed this thing is set to out pace everything in the meta game baring scarfed pokes. Also, if Moxie is going to continuously rack up theres no point in adamant because the moxie will compensate. This is normally a late game sweeper to bring it all home. The idea is set up a sub with Gliscore and Baton Pass it to this monster and set up a free DD and then just proceed to sweep teams. The Lum Berry is there incase Gliscore isnt there to set up a Sub, this way incase anything trys to status Gyrados it will be all set to sweep regardless. Waterfall for STAB and a rain boost will hit very hard to anything that doesn't resist it, EQ is for Ferrothorns and anything that resists Waterfall, and Stone Edge is there for Flying types ( mainly the dragons that resist both EQ and Waterfall ).

Tentacruel ( Harpoon )- Bold
252HP/ 240Def/ 16Speed @Black Sludge
Ability- Rain Dish
Protect
Toxic Spikes
Rapid Spin
Scald
The teams Rapid Spinner and Toxic supporter. I use to use Vaporeon, but then when I saw a Stealth Rocks problem I knew Tentacruel was soon going to replace Vaporeon. I decided that its good Sp.Def stats wouldn't need much of an invesment so I ran it bold to bulk it up a bit, Anyways the set is pretty stright forward: Set up T-Spikes, Rapid Spin Rocks away. Protect is for scouting/ recovering a bit. I chose Black Sludge because I wanted to punish Trickers a bit. So if they tick my Tentacruel, they will lose HP everyturn which can really rack up after Toxic dammage and Black Sludge.

Jolteon ( Drive By )- Modest
6HP/ 252 Sp.Attack/ 252 Speed @ Choice Specs
Ability: Volt Absorb
Volt Switch
Thunder
HP-Ice
Shadow Ball
I must say, the moment I found out this thing has base 525 Sp.Attack w/ Specs, I just wanted to abuse this thing so much. Jolt normally leads unless there are ground types then its normally Gliscore. The plan is to Volt Switch the first turn then wait till rain is set up and proceed to abosolutly run wild with Thunder. This thing also make a very solid Check to Thunderous- T. HP-Ice is able to OHKO after rocks dammage. With this things base speed of 130, Jolt is able to out pace every poke in the meta game baring Timid Tornadus-T, and its also able to out pace so scarfers as well. Shadow Ball is kinda a filler move and it works well w/ Deoxys-D leads able to 2HKO it. It also works as a "safe move" for when there is a ground type still lingering on the opponets team. This thing can also absorb some of the Electical attacks aimed at my Poiltoed, Tentacrule, or even Gyarados.

Celebi (Trollerbi)- Modest
108HP/ 200Sp.Atk/ 200Speed @Lefties
Ability: Natural Cure
Thunder Wave
Stealth Rocks
Giga Drain
HP-Fighting
I had alot of things in this last slot: Breloom, Alakazam, but none of them worked out very well. I also saw over time that rock support was really needed for my Jolteon and Gyarados to get the KOs they needed. What made me choose Celebi is the fact that I saw that when my Jolteon whent down I really struggled with other rain teams and it would turn into a stall fest and blah blah blah. STALL. So! I brought in Celebi. It gives both rock support and T-Wave, which is really useful for catching things on the switch like Tornadus-T, Terrakion, to name a few. Giga Drain is for STAB as well as helping Celebi live a little bit longer. Hp-Fighting is used mostly for Ferrothorns which can really check this team unless my Gyarados has like +3 or something. But HP-Fighting is about a 3HKO and Celebi almost always forces Ferrothorns to switch after they set up hazzards.
So that's the team. If you have any futher questions about them please feel free to ask. Again, I've only been playing singles for a few months so any kind of help would be great. Thanks!