>>11840665The tools are out there for anyone that wants to be competitive to make pokemon with precise EV training, perfected IVs, and make them indistinguishable from pokemon obtained through in-game means.
Some players will stick with what they like and they can do well because of how the game is built mechanically, but if you want your Infernape or Latios to be the absolute best of the best, (or more accurately compete at a fair level against other players that use the same pokemon), you're probably going to hack it in.