So as you know certain pokemon need to be evolved via trade or traded while holding an item, so you are probably wondering how to evolve them on VBA, its easy, they don't need to be traded, they replaced them with a level to evolve at, commonly they will evolve through levels 35-45, you can find certain people in the game who actually tell you what level certain pokemon evolve at like for example: Gloom to Vileplume Lv.40, or Graveler to Golem Lv.40. have fun!