>>33708395There are basically 2 good ones (PokeMMO and Pokemon revolution online) afaik and 1 weird 3d one that is still early in development I believe.
PokeMMO seems the best atm. even though PRO has more gens (MMO has 1 and 3 while PRO has first 4 gens. (But pMMO will get 2 more gens this year)
PokeMMO has Fly and PRO doesn't and it also has forced rebattles on routes so it makes moving in the world really slow at times, while pMMO has voluntary rebattles with higher level mons.
PokeMMO has Breeding while PRO doesn't so you need to rely on luck to get comp mons.
PRO has better graphics while PokeMMO has mods to make the game look better.
Also there was some drama in PRO and one of the devs is making hes own Pokemon MMO (code name PRO 2.0) game with better graphics etc. so that will reduce the popularity of PRO 1.0 so at least I don't feel too confident on investing my time on that atm. as it might just die off.
PokeMMO has good trading system in a form of Global Trade Link, pic related.
PokeMMO has Battle Frontier
And the list goes one, just ask if you want to know anything specific.