There is A Pokemon MMO Called PokeMMO

Pokemon multiplayer

Why aren’t you playing yet? It’s (hopefully) everything you wish Pokémon was!

Download for Windows, Mac, Linux, Android

Uses ROMs to dodge Nintendo’s hammer

Why play?
-Competent AI adds challenge to your gameplay

-Levels are capped per badge to ensure battles are balanced, EXP isn’t lost

-Follower Pokémon

-You can challenge other players to duels

-You can spectate other players’ battles

-It’s an MMO, shiny values are not damaged by external cheat devices, making some extremely rare and valuable.

-IVs and EVs add actual value to a Pokemon

-EVs/IVs are visible in a Pokemon’s summary window

-Smogon Tier system, OU, UU, NU, LC, Dubs, Trips, Rot., 4 player Contests

-PvP automated matchmaking for quick and easy duels

-Ranked PvP ladder

-Breeding is important to creating a competitive team

-Competitive Pokemon are worth more money.

-Official PvP tourneys/catching comps with shiny prizes

-Holiday events with exclusive prizes

-Tons of user ran events

-Vanilla regions to relive childhood

-Kanto, Hoenn, Unova, and soon Sinnoh

-Freely switch between the three regions after your first 4th badge

-Battle Frontier can be played co-op

-4 player Contests (Gen 3 Contests)

-In-game Market and Global Trade System

-Pokédex contains useful information, such as learnsets and egg groups

-Fair degree of Player Customization, including attire based on other franchises

-‘Ocarinas’ that act as a reusable HM that doesn’t need a Pokemon; Collect em all and cast aside your HM Slaves

-Gen 7 Learnsets/Stats/Abilities as long as they exist in Gen 5

-All Pokémon can learn their event moves from any gen if they have one

-Gen 6+ weather changes

-BW seasons, also changing every month in Kanto and Hoenn, not just Unova