>>38936188>sleep clause Without SC in place you would have situations where people would bring very fast Pokemon with a sleep move, and then set it up so that they can put to sleep any mon their opponent swaps in. It's not fun to fight against, and it would force you to run subpar items, abilities, or Pokemons just to counter that one strategy.
>evasion clauseSingles is already a very stally environment. Adding evasion into the mix will not only make it even more stally, but will also add an extra layer of RNG causing every game to be dragged out stall fights that no one enjoys. It will also create a similar problem like with SC where you will be force to run subpar moves, Pokemons, abilities, or items just to counter a single strategy your opponent may or may not use.
>tiersPut in place to give every Pokemon an fair environment to fight in. It gives a chance for you to use Pokemons you normally wouldn't be able to run in a setting like battle spot singles due to nothing stopping your opponent from just running Mega Kang, Lando-T, and Tapu Koko every game. The "bans" in Smogon are when a Pokemon gets sent to Ubers.
