Aphro Teambuilding:
- Roles: there are different types of pokemon: sweepers (pokemons who has high speed and atk or sp atk ex:infernape), offtanks (slow mons with high hp, defenses and atk or sp atk ex:conkeldurr), deffensive mons (mons who has high hp and defenses with utility moves like hazards, toxic... ex:skarmory) and suicidal leaders (pokemons who can learn stealth rocks or something like this and offensive moves ex:deoxys speed).
Hazards: attacks that cause indirect damage to the enemies when you put them on the field. Stealth rocks: it does 12.5% of your hp when your put your mon on the field, it's a rock type move so it will do 25% against fire, ice, fly and bug mons/ 6,25% against fight, steel and ground mons/ if you have a mon who is fire + bug it will do 50% of your max hp's and if you have a mon who is steel + ground it will do about 3%). Spikes: it does 12.5% of your hp regardless of type, you can put more than 1 spike (max 3), with 2 spikes it will do 16.67% and with 3 it will do 25% (levitate, air ballon and fly mons don't take damage of spikes cause it's a ground move). Toxic Spikes sets an entry hazard around the target Pokémon. One layer of Toxic Spikes causes opposing Pokémon to acquire the Poison status ailment upon switching in, while two or more layers causes opposing Pokémon to become badly poisoned. Toxic Spikes has no effect against Flying-type, Poison-type, or Steel-type Pokémon or Pokémon with the Ability Immunity, Levitate, Leaf Guard (during intense sunlight) or Magic Guard. However, a Flying or Levitating Pokémon will be affected if it is switched in while holding an Iron Ball, while Gravity is in effect or if Baton Passed an Ingrain. If a Poison-type Pokémon that is not also a Flying-type or has the Ability Levitate is switched in, it will absorb Toxic Spikes and the effect of Toxic Spikes will end. You can use moves like rapid spin (it won't remove light screen and reflect and it doesn't affect to ghost mons but it won't remove the hazards in the field or your enemy) or defog (it will remove the reflect and light screen of your enemy and both hazards on the field) to remove the hazards.
- Always have an odd number of hp with some exception (cause damage of rocks, substitute...). Ex: If u have a victini with 400 hp it will die after 4 rocks (25% of hp/ 100 + 100 + 100 + 100 = 400), well if u have a victini with 401 it will live with 1hp so you can use your victini 4 times (it's the same with 399, 397, 401, 395...), with a pokemon like hoopa you can use it 9 times, if u have an even number of hp you only can use it 8 times. It's the same with the substitute, if you have 401 you can use sub 4 times and you will live with 1hp if not you can only use sub 3 times.
- Offtanks (offensive tanks) and leech seed damage. An offtank is a mon who has a high number of hp and atk or sp atk (tyranitar atk offtank, heatran sp atk offtank). Ex: 252 SpA Life Orb Latios Surf vs. 248 HP / 4 SpD Heatran: 242-286 (62.8 - 74.2%)/ 252 SpA Life Orb Latios Surf vs. 0 HP / 128 SpD Heatran: 216-255 (66.8 - 78.9%). Well if you have a heatran with 248 hp, 252 spa, 4 def and 4 spd surf will do against you 62 - 74% of your hps, if you have 128 def, 128 spd and 252 spa it will do 66 - 79%. Apparently the first distribution of the evs seems better cause the surf does 5% less. Well if you have an steel monotype (we are talking about heatran) i'm sure that you will have celestela or ferrothorn with leech seed. The point is, if you have less hp the leech seed will heal + your heatran cause if he has 400 and he drain a mons with 400 hp it will recover you 12.5%, but if you are 128 both defenses it will recover + % cause you have less hp than him. Heatran has a nice core with skarmory and ferrothorn and if you run 128 both defenses with leech seed ferro or cele + heatran with protect you will have a nice coverage and your heatran will have more longevity (you are recovering + hp's than you are losing). In the other hand, if an enemy leech seed your heatran and you are 128 both defenses you will have less hp so he will recover less hp 2. Ex: Heatran 128 both defenses and 252 spa (protect, toxic, lava plume and X), Ferrothorn 248 hp 252 def 8 sp def (leech seed, protect, toxic and off move like knock off, power whip or gyro ball) and celestela 248 hp 8 def and 252 spd (you can youse 2 mons with leech seed, it's ok in steel cause your counters are water, ground... and celestela can learn a lot of moves you have to covers whats left with it, gigadrain, flamethrower, air slash, heavy slam, hp ice, eq...).
- Coverage: you need pokemons to cover the damage against the pokemon that you are weak. Ex: dark type is weak against bug, fairy and fight so you need pokemons who can tank them, ex of dark core: mandibuzz has a nice hp (423) and a lot off def and sp def, it can take bug and fight moves and learn defog, whirlwind..., mega sableye has a lot of both defenses and he has resistence against bug and inmunity against fight, this mon is great cause he has magic bounce (this pokemon blocks certain status moves and bounces them back to the user) and can learn a lot of great moves and you will tank fairy moves with muk who has a lot of hp's and spd, it has resistence against fight and bug moves 2. In the other hand you need attacks that can pokemons who resists you (fairy and fight). Mons who can hit fairy: bisharp, muk... Mons who can hit fight: greninja with protean and paranormal, sharpedo with psychic fangs, hoopa...
- Movesets: depends on the type of pokemon that you have you have to learn some moves or other. Deffensive mon (mons who can tank damage and contribute with utility). Ex: Cradily 248 hp 8 def and 252 with recover, gigadrain, stealtch rocks and tóxic/mirror coat (leftovers). Offtank mon (mons who can tank damage and has a nice damage 2). Ex: Tyranitar 248 hp 132 atk and 128 (-speed + atk or sp atk) with stone edge, dark pulse, fire blast and crunch with assault vest (it's good on rock monotype).
- Playstyles: the different types have different styles of play between them. Psy hasn't enough good walls against dark, ghost and bug so it's a offensive monotype, in the other hand steel has a stall and boost playstyle cause they are bulky, slow and has a nice coverage of secondary types. Dark is a balanced type who has nice coverages and good sweepers.

Example of competitive team:
Sableye-Mega @ Sablenite  It can tank fight and bug mons and has a nice moveset for the stall.
Ability: Prankster
EVs: 248 HP / 8 Def / 252 SpD
Careful Nature
- Toxic
- Will-O-Wisp
- Recover
- Knock Off
Mandibuzz (F) @ Rocky Helmet  It can tank fight and bug mons 2, his job is stop the physical sweepers who can get boosted.
Ability: Overcoat
EVs: 248 HP / 252 Def / 8 SpD
Impish Nature
IVs: 0 Atk
- Defog
- Foul Play
- Whirlwind
- Roost
Muk-Alola @ Assault Vest  Can tank fairy moves and kill them, fire blast works good against your counters like ferrothorn or scizor.
Ability: Poison Touch
EVs: 248 HP / 124 Atk / 136 SpA
Brave Nature
- Fire Blast
- Gunk Shot
- Knock Off
- Shadow Sneak
Bisharp @ Focus Sash  It could be tytar or kroko, i prefer bisharp cause steel type. This pokemon can stop boosts with tw and put rocks
Ability: Defiant
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Stealth Rock
- Thunder Wave
- Knock Off
- Iron Head
Greninja @ Life Orb  This mon can learn a lot of moves and it has 370+ speed, paranormal is good cause ifn't you can't hit keldeo but it can be water shuriken, u-turn, rock slide (cause volcarone and charizard y) etc.
Ability: Protean
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Pulse
- Extrasensory
- Ice Beam
- Hydro Pump
Hoopa-Unbound @ Choice Scarf  This pokemon can sweep in the late game. It's a good fight and water slayer (the first type is your counter and the 2nd type one of the must used types on mono) focus blast is necessary cause you need some fight move in your team (steel is the most used type on mono and u will need fb to hit scrafty for example).
Ability: Magician
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Psychic
- Energy Ball
- Focus Blast
- Thunderbolt