Below there are the most used rules used here in the forum.
When you just say Standard rules, you're immediately agreeing with them when opening a thread.
You can't use sleep inducing moves in opponent's Pokémon when there's another Pokémon in his/her team asleep. Yawn can't be used to PseudoHaze (make opponent switch) when there's another Pokémon asleep caused by you. When the asleep Pokémon awakes or faints, you're free to make another Pokémon of his/her team asleep. Sleeping being caused by Effect Spore or Rest are disconsidered from Sleep Clause.
- Sleep Clause
You can't use two of the same Pokémon in a team.
- Species Clause
You can't use moves that increases your evasion. Avoid the use of Acupressure, it has 1/7 chance to double your evasion.
- Evasion Clause
You are strictly prohibited of using OHKO moves. They are Guillotine, Horn Drill, Fissure and Sheer Cold.
- OHKO Clause
Don't need to explain, you are prohibited to use any illegally obtained Pokémon. Hacking parents to breed is also unaccepted, but people can't control this just looking at the stats. Hacking Pokémon with "legit stats" is also not allowed.
- No Hacks
Uber Pokémon are overpowered Pokémon. Since these are "Standard Rules" you have to use the "Standard Pokémon".
- No Ubers
The current uber list:
Deoxys (all forms)
- ***Note: In Standard Uber Battles, these Pokemon are allowed. In UU/NU battles, only Pokemon in the specific tier and below are allowed. This means you can use NU Pokemon on a UU team, but not UU Pokemon on a NU team. All other clauses are the same for a Standard battle that uses a different tier.
These are all the items that relies on luck to activate. These items are:
- No Hax Items
Brightpowder, Focus Band, King's Rock, Lax Incense, Quick Claw, Razor Fang, Razor Claw, Scope Lens, Lansat Berry, Stick and Lucky Punch. Note: Scope Lens, Razor Claw and Stick are hax items, but they are the only ones allowed in competitive play, as they just increase the odds of something that can already happen.
You can't turn off your DS or move away from signal range to end a battle. People can have weak routers so don't always fight with the people if he/she disconnected. Not exactly a rule, but an ethic sense.
- No Disconnecting
These are the rules that most people play, and below there're unusual rules usually applied, but it's outside of Standard:
Spoiler:- NOT STANDARD RULES!:
The list may seen big, but they're easy to remember.
These (the standard) are the main ones you'll use in any kind of battle, but we also have variations for the Standard battles, and they are:
- Double Battle
Introduced in third generation, battle with four Pokémon in the arena, two from one side, two from opponent's. Very diferent style with a wider range of decisions you have to make in one turn.
- IV Battle
While breeding, if you wanna know accurately your Pokémon's IVs, this is what you should do. Set a battle to level 100, write down the stats and calculate until you got the Pokémon you were looking for.
- Roulette Battle
A battle that you use all your competitive Pokémon. First of all, you must be honest while doing a Roulette Battle (Actually, you should in all battles, but this gets special care). Before asking/answering to a Roulette Battle you should organize all your competitive Pokémon in your box(es) in a random order, but without spaces, both battlers count how many Pokémon they have and the player randomly chooses six numbers from the total his opponent said. The number corresponds to the position the Pokémon is in the box and the player has to use those Pokémon in the battle, the first number your opponent wrote also corresponds to the first Pokémon you'll send in the battle. Then it's just a standard battle! Meaning you can't bring Uber Pokémon, you can't use hax items, you can't sleep two opponent's Pokémon, all standard rules include, unless your opponent says his own rules.
- UU Battle
Again, a simple standard battle, but not only Uber Pokémon are excluded, OU and BL Pokémon also are banned in rule number 6.
- Monotype Battle
Another variation from a standard battle. Your entire team must have one type in common among all Pokémon. Double types are allowed, the only thing required is that one of the Pokémon's type has to match with the rest of the team's type.
- Everything goes battle
A battle people who are not into the competitive play use. It means that no rules are applied, hence, everything is allowed.
Done! If there are more rules that I forgot, then sorry, post them here and I'll add it. Any doubts about the rules, just post here and we may help you.