[Ash singh12]

I'm a player in pokemon showdown battle, i think we combine some rules in game: (sorry for my english -.-)
1. Species clause: same u said, cannot have two of the same pkm on their team (arceus and genesect form, charizard - mewtwo X/Y..etc..), exception kyurem-black-white..
2. Rb and mega clause: only max 3 reward box pkm in team (valuable pkm in wild-let's catch) and only 1 (maybe 2-will discuss) Mega pkm - this will make battle more tactical, exception kyogre primal - groudon primal (it's not mega form in basic game)
3. Overpower ability: only 2 pkm have each overpower ability in team (Perfect body, Camouflage, Radiation, Expert Regenrator, Accuracy decreaser, Evasion master - anyone find more, thanks). Note: 2 pkm for each ability in team (can have 2 pkm perfect body, 2 pkm camouflage..etc)
4. Overpower move: same ability's rule, some move: Swagger, Perish Song, Double Team, Sky Attack, Outrage, High Jump kick..etc (OHKO move too)
5. Sleep clause: cannot put 3 or more different opposing pkm to sleep using attacks that induce sleep to opposing pkm.

in short u r afraid to handle them