Introduction
When building a team for whatever reason, you should consider thinking a main strategy for a team. Also, you should decide to use Pokémon with different types, which goes well together. What you should also do is actually to try out Pokémon, which are currently more used by the community, or try out teams that pros use and adapt it to yourself.
Consider basing your team around a specific battle mechanic:
Some Pokémon can take advantage of certain effects in ways that others can't, so many trainers either build teams from them, or specifically to counter them. Examples of these mechanics:
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Baton Pass teams - Boosting the stats of a tank, then using Substitute and Baton Pass to safely pass the boosts to a sweeper.
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Tailwind teams - Doubles the speed of all Pokémon on the user's team. Generally used to boost the speed of medium-speed Pokémon.
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Trick Room teams - Causes slower Pokémon move first for five turns. Applies to every Pokémon on the field.
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Weather teams - Various effects depending on the type of weather active (Harsh Sun, Hail, Sandstorm, or Rain), and the Pokémon on the field.
Here is an example for a battle mechanic. Here, Pelipper is going to use tailwind to become faster than Jumpluff, to then attack first.
Purposes for individual Pokémon on a team
Every member of a team have a purpose, it can range from sweepers to healers. Pokémon can have many purposes and considering this, here are some purposes that every team in competitive Pokémon has that you should also have.
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Clerics/Healers - Heals/removes inflicted status conditions from their teammates.
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Crippler - Inflicts the opponent with status conditions, paving the way for Sweepers.
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Leads - The first Pokémon that's sent out the start of the battle; are generally fast, allowing them to setup entry hazards, delayed moves, field conditions, or to counter the opponent's lead. May also be bulky, allowing them to setup hazards multiple times throughout the match.
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Stallers - Inflicts status conditions (generally Toxic), then alternates as needed between Substitute and a healing move until the opponent faints.
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Sweepers - Pokémon with high Attack/Sp.Atk and Speed that can quickly KO the opponent with high power moves (once a path has first been cleared for them of course).
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Tanks - Pokémon with high defensive & decent offensive stats that can take attacks and actively retaliate; may sometimes carry support, defensive, or status-inflicting moves.
There are much more than these purposed!
The type chart:
Some Pokémon can take advantage of certain effects in ways that others can't, so many trainers either build teams from them, or specifically to counter them. So give your team variety. Generally, no more than two Pokémon per team should share the same type. This both reduces the amount of common weakness, and allows each Pokémon more opportunities to counter their opponent.