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Typically, a Gen X Format refers to the generation of a Pokémon game that is released.<br>
A game with a Gen 9 Format would only include Pokémon and moves from that generation, making older mechanics, moves and abilities unavailable. 

Since Pokemon Revolution Online (PRO) is a Massively Multiplayer Online Game (MMO), restricting it in such a way would remove many aspects of the game.<br>
Therefore Pokemon Revolution Online uses the Generation 9 National Dex (Gen 9 NatDex) Format.

==Gen 9 NatDex Format Overview==

This format allows the use of all available Pokémon, Moves, Abilities, Battle Mechanics and Items, while being updated to Gen 9 if available.

The rules are:<br>
* If a move is learned by a Pokémon in Gen 9, it learns it in PRO.<br>
* If a move cannot be learned by a Pokémon in Gen 9, but was available in Gen 8, it learns it in PRO.<br>
* If a move cannot be learned by a Pokemon in Gen 9 or Gen 8, but was available in Gen 7, it learns it in PRO.<br>

This battle format also allows the use of old mechanics, like Hidden Power, Mega Stones, Z-Crystals, the weather condition Hail, Pursuit and more.<br>

While the format follows the rules above, it's worth noting that some moves are currently [[Broken Moves & Abilities|either incorrectly coded or missing in PRO]] but will be updated in the future.

==Exceptions==

While PRO follows this system closely, rare exceptions exist.<br>
These exceptions may be made due to balance concerns or to prevent certain Pokémon from becoming irrelevant.<br>
For example, Greninja's Battle Bond ability was changed in Gen 9, but this change was not implemented in PRO and instead Battle Bond retains its mechanics from Gen 7 and Gen 8.

==External Links==

*[https://www.smogon.com/dex/sv/formats/national-dex/ Smogon National Dex]