Do the nuzlocke challenge, it's the best way to play. It forces you to have non-op pokemon in your team and brings risk and tension. Obviously you need to be honest. IV, EV and breeding is boring nerd grind shit, unless you want to compete in MP.

"The Nuzlocke Challenge has only two rules that the player must follow. These are referred to as the "core" rules, and are as follows:

Any Pokémon that faints is considered dead, and must be released or put in the Pokémon Storage System permanently (or may be migrated or transferred with Poké Transfer, as long as the Pokémon is never able to be used again during this run).
The player may only catch the first Pokémon encountered in each area, and none else. If the first Pokémon encountered faints or flees, there are no second chances. If the first encounter in the area is a double battle, the player is free to choose which of the two Pokémon they would like to catch but may only catch one of them. This restriction does not apply to Pokémon able to be captured during static encounters, nor to Shiny Pokémon."